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Rainbow Science Experiments
Everything is brighter with rainbows even a rainy day because that’s the perfect time to hope to see one! Whether you are looking for a pot of gold at the end or love the way the colors combine, exploring rainbows through science and STEM activities is a great way to get started! Find a fun selection of simple to set up rainbow science experiments to try out all year long. Any time of the year is perfect for exploring rainbows!
Explore Rainbows
Over the past year, we have explored rainbow and rainbow-themed science experiments. The difference? We have studied how real rainbows form and how light science plays a role in creating rainbows.
However, young kids also just love fun, rainbow-themed science activities that also showcase simple science concepts such as reactions , polymers , liquid density and crystal growing .
Below, we have included both kinds of rainbow science experiments. But before you get into all the fun, read on to learn some rainbow science.
How Rainbows Are Formed
A rainbow is formed when light passes through water droplets in the atmosphere. The water droplets break white sunlight into the seven visible spectrum colors. You can only see a rainbow when the sun is behind you and the rain in front of you.
There are 7 colors in the rainbow: violet, indigo, blue, green, yellow, orange, and red.
Make sure to look out for a rainbow next time it rains! Now, let’s try a rainbow science experiment or two!
Free Printable Rainbow Activities Guide and STEM Cards
Download this free mini Rainbow pack to get started today!
Want to turn a rainbow science experiment into a rainbow science project? Check out our easy science fair project ideas!
1. Make A Rainbow
Grab some prisms, old CDs and more, and explore how visible light can split into the colors of the rainbow.
2. Rainbow Crystals
Grow crystals using a classic crystal growing recipe with borax and pipe cleaners. This rainbow science activity really grows awesome crystals that are both sturdy and beautiful to look at. Create a science craft with a pipe cleaner rainbow design!
3. Erupting Rainbow Science Experiment
A classic reaction for simple chemistry and a mix of colors to create an erupting rainbow!
4. Walking Water Rainbow
This walking water experiment is incredibly easy and fun to set up for kids. Watch the water travel as it makes a rainbow of color, and learn about capillary action too!
Here is another way to set it up that’s great for groups of kids, and younger ages! See our grow a rainbow experiment.
5. Build LEGO Rainbows
Explore symmetry and design with a rainbow LEGO building challenge.
6. Rainbow Density Experiment
Super easy kitchen science using sugar, water, and food coloring. Explore the density of liquids to create a rainbow.
7. Make Rainbow Slime
Learn how to make the easiest slime ever and create a rainbow of colors!
8. Rainbow Fizzing Pots
A leprechaun’s dream with a cool chemical reaction in mini black cauldrons!
10. Rainbow Oobleck
Oobleck is an awesome science activity for exploring non-Newtonian fluids. Do you know what a non-Newtonian fluid is or how it works? Learn more through this hands-on activity that uses basic kitchen ingredients.
11. Rainbow Solubility
Make this fun rainbow craft with a few simple materials and explore solubility in the process.
12. Make a Spectroscope
A spectroscope or a spectrograph is a scientific instrument used to study the properties of light. It breaks light down into different wavelengths, called a spectrum. It works similar to how a prism splits white light into a rainbow .
12. Grow a Rainbow
Explore capillary action with markers and paper towels. “ Growing a rainbow ” is a fun science demonstration for various ages!
More Fun Science Topics To Explore
- Baking Soda & Vinegar Experiments
- Simple Machine Projects
- Chemical Reaction Experiments
- Density Experiments
- Water Experiments
- Capillary Action
Helpful Science Resources To Get You Started
Here are a few resources that will help you introduce science more effectively to your kiddos or students and feel confident yourself when presenting materials. You’ll find helpful free printables throughout.
- Best Science Practices (as it relates to the scientific method)
- Science Vocabulary
- 8 Science Books for Kids
- All About Scientists
- Free Science Worksheets
- Science Supplies List
- Science Tools for Kids
Printable Science Projects For Kids
If you’re looking to grab all of our printable science projects in one convenient place plus exclusive worksheets and bonuses like a STEAM Project pack, our Science Project Pack is what you need! Over 300+ Pages and 90 projects!
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I love using your projects with my grandson. I am now faced with distance learning for my students. I am a STEM teacher at an elementary school. A lot of your project lend themselves easily to distance learning. What is your position on using some of your projects in my Google Classroom? Please advise. Thank you.
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Preschool Inspirations
Preschool Activities and Learning
Super Fun Rainbow Science Activities Just For Kids
March 8, 2018 by Editor Leave a Comment
Rainbows are one of my favorite parts of Spring. It usually means that the sun is shining and I’m always happy with that. Even though it usually means it is raining as well, but I’ll take the sunshine when I can get it! Incorporating rainbows in science activities is not only fun but super easy. These Rainbow Science activities are perfect for the classroom or at home. Most of them don’t require much prep but all of them will have kids smiling in science giddiness!
Rainbow Science Activities
Finally a rainbow discovery bottle that the colors don’t run together! I’ve been trying and experimenting for a while now and finally figured it out! It’s not quite liquid and not solid either. It’s a perfect combination of awesomeness! Want to make one of your own? The full tutorial is here .
Get the best learning activities for 3-5 year olds at your fingertips
See inside the book!
We’ve all done baking soda and vinegar experiments, right? This Baking Soda & Vinegar Reaction though is the most colorful I have seen and I can just imagine how excited kids will be to see the rainbow foam explosions!
Oil and water make science experiments super easy and fun. This Rainbow Jar is extra fun, not only because of the colors, but it is mesmerizing how the colors stack up on top of each other!
These candies are fun to eat but even more fun to play with. This Skittle Rainbow is beyond the best candy experiment I have seen. I could watch this for hours!
Chromatography is a fun way to incorporate science and art together. These Rainbow Filters are fun to create but then also fun to create with!
Did you know that dish soap can do magical things? This Magic Rainbow Milk is purely magical. The colors move seemingly on their own, but are they moving on their own?
When science and sensory connect, it is always a great activity. This Scented Rainbow Science is perfect for sensory seekers! Plus, adding the scent is probably the easiest part!
This Exploding Rainbow is exciting to create and even more exciting to watch. Kids will enjoy these hands-on mini ‘explosion’. Even if we know it is only a simple reaction, kids will love to pretend their rainbows are exploding!
There is something incredibly fun about swirling your hand around in a big bowl of soap foam! This Rainbow Foam Bubbles activity is not only a fun sensory activity but also helps teach about color mixing as well.
Rainbows are pretty but Giant Crystal Rainbows are even more beautiful. Kids will enjoy watching the crystals grow on their rainbow! It may take a day but the magic of the crystallizing process will not be lost!
This Fizzy Rainbow Slush takes baking soda and vinegar to a whole new level. Plus if it is hot outside, you can place this slush in the fridge for a while and the kids can play in cold slush!
This Rainbow Sugar Water Density shows that adding sugar to colored water can help the colors separate instead of mixing together, which is excellent for younger children. This is also a fantastic way to introduce or teach about density for older children!
Pumpkin Seeds are not only for fall. These Pumpkin Seed Discovery Bottles are rainbow all the way and is a go-to activity for any time of the year!
Do your kids love playing with ice? And melting ice with hot water? This Rainbow Ice Tower is filled with colorful items frozen into a tower and the excitement is getting them out! I can see kids being occupied for quite a while with this one!
Science these days is not complete without slime and this Rainbow Slime is a MUST. It is absolutely beautiful how the colors connect but don’t mold together. This recipe is anything but icky!
Just like with the skittles experiment above, this M&M Rainbows is mesmerizing! It is incredible how candy can taste AND look so beautiful!
I love how this Erupting Rainbow comes out of little test tubes. Kids will feel like real scientists even though this experiment is incredibly simple!
This twisted rainbow is sparkly in all the right ways. Kids will enjoy creating this Salt Crystal Rainbow and displaying it all Spring long!
Sometimes science is simple and other times it is purely magical. The art that this Rainbow Paper experiment can make is fantastic! This would be beautiful to put on the front of cards or notes!
This Walking Rainbow experiment has me screaming HOW in my head. I want to explore this experiment because it just looks unreal. Science is so fascinating and this is one of those worldly mysteries that would be fun to solve!
This Ice & Salt Rainbow actually creates craters. As pretty as it is, it can do crazy things when combined together. This would be a fun science activity to add to a small world play with dinosaurs or superheroes!
This Rainbow Colored Ants activity is purely fascinating. This would be a fun lesson to teach for either a bug unit or even Spring. Super interesting!
Rainbows are beautiful in the sky and can create magic in the real world. These Rainbow Science activities are a close second to being magical in the real world. Whether you are teaching a spring unit, teaching about the weather or just wanting some fun colorful activities – these science activities are sure to please!
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Cool Science Experiments Headquarters
Making Science Fun, Easy to Teach and Exciting to Learn!
Science Experiments
Rainbow in a Jar Science Experiment
Want to make your own rainbow? In this simple science experiment, kids can build their own rainbow in a jar while exploring density, mass, and volume.
Watch our demonstration video, gather your supplies, and print out our detailed instructions to get started. An easy to understand explanation of how it works is included below.
JUMP TO SECTION: Instructions | Video Tutorial | How it Works
Supplies Needed
- Tall Glass Jar
- Food Coloring: Red, Blue and Green
- 1/4 cup Honey
- 1/4 cup Blue Dish Soap
- 1/4 cup Water
- 1/4 cup Olive Oil
- 1/4 cup Rubbing Alcohol
- Jars for mixing and pouring
- Teaspoons for mixing
Rainbow in a Jar Science Lab Kit – Only $5
Use our easy Rainbow in a Jar Science Lab Kit to grab your students’ attention without the stress of planning!
It’s everything you need to make science easy for teachers and fun for students — using inexpensive materials you probably already have in your storage closet!
Rainbow in a Jar Science ExperimentInstructions
Step 1 – Add one drop of red food coloring and one drop of blue food coloring to 1/4 cup of honey and stir until combined. This creates a purple color liquid. Pour the purple liquid carefully into the tall jar.
Step 2 – Next add about 1/4 cup of blue dish soap to the tall jar.
Step 3 – Add a few drops of green food coloring to 1/4 cup of water and mix until combined. Then, carefully pour the green liquid into the tall jar. Tip: When pouring in the green liquid, tilt the jar so the liquid runs down the side of the jar slowly.
Step 4 – Wait a few moments and then slowly pour 1/4 cup of olive oil into the jar. Again, be very careful when pouring in the liquid. Make sure to tilt the jar and pour very slowly so the colors don’t mix.
Step 5 – Add a few drops of red food coloring to 1/4 cup of rubbing alcohol and mix until combined. Then, carefully pour the red liquid into the tall jar. Tip: I can’t stress enough how important it is to tilt the jar and pour slow. Otherwise, the colors will mix together and you won’t get a distinct rainbow.
Do you know why you were able to make the liquids form the rainbow in a jar? Find out the answer in the how does this experiment work section below.
Video Tutorial
How Does the Science Experiment Work
Density is the reason that this experiment works! Density is a measure of how much mass (or “stuff”) there is in a given volume. Density is a ratio of mass to volume and can be found by dividing an object’s mass by its volume (D=m/v).
Based on this equation, if the mass of something increases but the volume stays constant, then the density increases. Also, if mass decreases but the volume stays constant, then the density decreases. Density is all about how tightly packed the matter making up the material is in a given volume. Lighter liquids (like olive oil and rubbing alcohol) are less dense than heavier liquids (like honey and dish soap) because they have less matter in a given volume. Because olive oil and rubbing alcohol are less dense, they will float on top of liquids like water, dish soap, and honey. Liquids with a lower density will always float on top of liquids with a higher density.
All liquids have their own unique density. Water has a density of 1 g/mL (g/cm3). Objects will float in water if their density is less than 1 g/mL. Objects will sink in water if their density is greater than 1 g/mL.
I hope you enjoyed the experiment. Here are some printable instructions:
Instructions
- Add one drop of red food coloring and one drop of blue food coloring to 1/4 cup of honey and stir until combined. This is create a purple color liquid. Pour the purple liquid carefully into the tall jar.
- Next add about 1/4 cup of blue dish soap to the tall jar.
- Then add a few drops of green food coloring to 1/4 cup of water and mix until combined. Then carefully pour the green liquid into the tall jar. Tip: When pouring in the green liquid, tilt the jar so the liquid runs down the side of the jar slowly.
- Wait a few moments and then slowly pour 1/4 cup of olive oil into the jar. Tip: Again, be very careful when pouring in the liquid. Make sure to tilt the jar and pour very slowly so the colors don’t mix.
- Add a few drops of red food coloring to 1/4 cup of rubbing alcohol and mix until combined. Then carefully pour the red liquid into the tall jar. Tip: I can’t stress enough how important it is to tilt the jar and pour slow. Otherwise the colors will mix together and you won’t get a distinct rainbow.
Reader Interactions
October 15, 2017 at 3:22 pm
It was cool. Was it density
October 30, 2017 at 11:33 am
Hi it was Cooooolllllll….. It was because of the density
June 12, 2018 at 10:22 am
my kids enjoyed this presentation. They are doing it for a stem project
March 25, 2019 at 3:41 pm
How long did this project take to make and how long did it last until the colors started to mix? Also, what would be the guiding question of an experiment like this?
March 2, 2023 at 11:46 am
1.This experiment took around 20 minutes to put together. 2. It lasts for as long as you need if nobody touches it. 3. A leading question to this experiment could be ” Will all of the ingredients mix while i am pouring?”
I hope this helped:)
January 23, 2020 at 12:41 pm
its amazing my students loved it!
March 2, 2023 at 11:40 am
I did this exact project for the science fair this year and I won 2nd place. I made a full board about destiny and I made a question saying ” If I do not tip the jar or if i pour too fast, will the colors mix? The answer is yes! The colors did mix whenever I didn’t tip the jar and the rubbing alcohol sank down and mixed with the green and then since the extra liquid was in the green it mixed with the blue dish soap and began to be a big bubbly mess! 🙂
June 12, 2023 at 10:15 am
Can you put a top on the jar, shake the jar, mixing the liquids, will the liquids separate after sitting for hours or days?
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Walking Water Rainbow Science Experiment
Let’s make a walking water rainbow! There’s no better way for little scientists to learn about capillary action and color mixing than by making water walk (yes – walk!) in this colorful rainbow science experiment. This science experiment is a favorite of ours because it’s so easy to set up and the results are almost immediate.
Check out the simple step-by-step below and then gra b 30 more jaw-dropping (but easy prep!) science experiments kids will love from our shop!
Getting Ready
To prep, I gathered our supplies:
- 6 wide-mouth glasses or jars
- Paper towels (use the kind where you can select a size)
- Food dye or liquid water colors (red, yellow, and blue)
I grabbed the six small glasses first . We’ve had success using wide-mouth drinking cups and canning jars, too. Even though they all worked, just remember that bigger glasses will need more food coloring.
I ripped off six sheets of paper towel and folded each sheet in thirds, lengthwise.
We were using pretty small glasses, so I cut a few inches off the folded paper towel so it would fit in the glasses.
It’s a good idea to test your paper towel strip to make sure they fit properly in your glasses. They should be able to go from the bottom of one jar to the next without sticking up in the air too much. The paper towel on the left shows the just-right height. It’s important to set up this rainbow science experiment for success!
Making a Rainbow
This colorful rainbow science experiment is so simple and quick, it’s perfect for even the youngest little scientists. My 3 year old, Q, couldn’t wait to get started.
First, I had him line up the glasses and fill the first one with a good squirt of red watercolor , the third with yellow, and the fifth glass with blue. We left the other glasses empty.
Next, I helped Q add water to the glasses with color until the colored water almost reached the top.
We moved the glasses into a circle and added the paper towels . Starting with the red, we added one end of the paper towel and then put the other end in the empty glass next to it.
We continued around until the last paper towel was placed into the red glass.
We saw the color wick up the paper towel right away. This rainbow science experiment doesn’t take long to get going!
After another several minutes, the colored water had almost travelled the whole length of each paper towel.
Five minutes later, the water had traveled all the way up and then down the paper towel and was dripping into the empty glass.
The yellow and red water dripped into the empty cup to make orange! It made for a good lesson on color mixing.
After another five minutes, we could see the water level had dropped in the red, yellow, and blue glasses and rose in the once empty glasses as the water continued to travel from the more full glasses to the less full glasses.
We grabbed a snack and watched our beautiful rainbow science experiment during the next 20 minutes. The water continued to walk from the primary colored glasses to fill the secondary-colored glasses until all the jars were filled equally.
Not Working?
If you aren’t seeing much movement within a few minutes, it may be that you need to add more water to your colored water glasses. It really needs to be almost at the top for the water to walk quickly. So try topping off those glasses and seeing if that gets things moving.
If you see the water moving up the paper towel but it seems like it’s taking forever , it may be the type of paper towel you are using. You want a paper towel that will really hold a lot of water. We have used Bounty Select-a-Size and Target’s Up and Up Brand Select-a-Size with success.
It really is worth the extra effort of trying different cups and paper towels to get this activity to work. And once you have had success, don’t throw out those beautifully-colored paper towels or the colored water! We gently squeezed out our paper towels and let them dry in a heap on a baking sheet. We ended up with gorgeous tie-dyed looking paper towels to use for crafts and we used the leftover water as watercolors for painting with later.
The Science Behind It
This rainbow science experiment is as magic as the science behind it. The colored water travels up the paper towel by a process called capillary action . Capillary action is the ability of a liquid to flow upward, against gravity, in narrow spaces. This is the same thing that helps water climb from a plant’s roots to the leaves in the tree tops.
Paper towels, and all paper products, are made from fibers found in plants called cellulose . In this demonstration, the water flowed upwards through the tiny gaps between the cellulose fibers. The gaps in the towel acted like capillary tubes, pulling the water upwards.
The water is able to defy gravity as it travels upward due to the attractive forces between the water and the cellulose fibers.
The water molecules tend to cling to the cellulose fibers in the paper towel. This is called adhesion .
The water molecules are also attracted to each other and stick close together, a process called cohesion . So, as the water slowly moves up the tiny gaps in the paper towel fibers, the cohesive forces help to draw more water upwards.
At some point, the adhesive forces between the water and cellulose and the cohesive forces between the water molecules will be overcome by the gravitational forces on the weight of the water in the paper towel.
When that happens, the water will not travel up the paper towel anymore. That is why it helps to shorten the length that colored water has to travel by making sure your paper towel isn’t too tall and making sure you fill your colored liquid to the top of the glass.
Rainbow Science Activity Extensions
Turn this demonstration into a true experiment by varying the water level (volume) you start with and seeing how long it takes the water to reach the empty glass.
Or start with the same volume of colored water and change the brand, type (single vs double ply, quilted vs not) or length of paper towel to see how long it takes for the water to “walk” to the empty glass.
You could even use the same volume of water, same length and brand of paper towel but vary the height of the filled glass , by raising them up on books, to see how that affects the speed of the water as it “walks” to the empty glass.
Have you had enough fun with the paper towels? Try using other paper products to see how the type of paper effects the results. Try toilet paper, printer paper, newspaper or a page from a glossy magazine. What do you predict will happen?
Grab a Record Sheet
Help kids keep track of their results by grabbing our free record sheet! Then grab 30 more jaw-dropping (but easy prep!) science experiments kids will love from our shop!
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Rainbow Walking Water Science Experiment for Kids
This walking water science experiment is so much fun and super easy to do! My kids absolutely loved it! It even comes with free printable recording sheets for kids as young as preschool! Check out the video to see how easy this walking water experiment really is. This rainbow activity is perfect for spring science!
Walking Water Science Experiment
Ok, this might just be our favorite science experiment! The whole family (adults included) were completely mesmerized with process. We all couldn’t believe how quickly the water traveled up the paper towel and neat it was to watch the colors mix together.
We have wanted to try it out for a long time now and I am kicking myself for waiting so long. I don’t know why, but I thought it might be difficult to do or take a long time. I was way wrong. It was very easy and we started seeing results right away!
Related: Simple Spring Science and STEAM Activities
The walking water science experiment is great at any time of the year, but it is especially perfect for spring. I love doing rainbow activities in the spring, so this was a great addition to our rainbow theme activities.
If you are looking for simple science to do with the kids and something that will really WOW them, this is definitely one to try.
You only need a few simple supplies that you probably already have around the house.
Setting Up the Rainbow Science Experiment
Supplies Needed:
- Printable walking water recording sheets (button to download at the bottom of the post)
- Small plastic cups or glasses
- Paper towels (*read my tips below for picking the right ones)
- Food coloring in primary colors
* The pick-a-size paper towels are best because then you just use half sheets for each cup. If you only have full sheets, then cut them in half. I’ve also heard that more absorbent paper towels work better too. I buy the cheap store brand ones, and our water moved pretty quickly from cup to cup, so I am not sure how important that is. It may have went quicker with something more absorbent though.
1. Print out the recording sheets and make copies, if needed.
2. Place 7 cups in a row and pour water in the 1st, 3rd, 5th, and 7th cup. My cups were about 3/4 full. I have since heard that fuller is better.
3. Add 5 drops of red food coloring to the 1st cup and the 7th cup.
4. Add 5 drops of yellow food coloring to the 3rd cup.
5. Add 5 drops of blue food coloring to the 5th cup.
Doing the Walking Water Experiment
You want to try to use the same amount of food coloring in each cup. When I did this with my kids they did drop an extra one or two in since they can’t control it well, but I just added a drop or two more to the others to even it out.
6. Take a half sheet of paper towel and fold it in half lengthwise and in half again lengthwise.
7. Trim off some of the length so that there isn’t too much excess paper towel that will stick up in the air between each cup. This will make the water walk more quickly.
8. Place one half of a rolled paper towel in the 1st cup and place the other half in the cup next to it. Then another paper towel from 2nd cup and into the 3rd cup. This continues until you have placed the last paper towel that drapes over from the 6th cup to the 7th cup.
9. Stare at the cups and watch what starts happening. You should quickly be able to see the colored water begin to crawl up the paper towel.
10. Don’t forget to do the first part of the recording sheet. Students will predict what they think will happen.
This walking water experiment is AWESOME!
Keep checking back every couple of minutes. Soon you will be able to see that the water has crawled all the way up the paper towel and is beginning to walk back down into the empty cup next to it.
Since the cup on either side of an empty cup has colored water in it, the two colors begin to mix in the empty cup. So cool!
Keep coming back throughout the two hours or soon and observe what is happening.
Question to Ask
What do you think will happen to the water?
What is happening now?
Why do you think the colors are changing?
Why might the water be able to move up against gravity like that?
How this Science Experiment Works
The water moves up the paper towels through a process called capillary action. The paper towel is made from fibers and the water is able to travel through the gaps in the fibers. The gaps in the paper towel act like capillary tubes and pull the water upward. This is what helps water climb from a plant’s roots to the leaves at the top of the plant or tree.
The water is able to move upward against gravity because of the attractive forces between the water and the fibers in the paper towel.
I even removed one of the red cups and made a color wheel so I could introduce the kids to that as well.
I hope your kids have a great time with this super cool walking water science experiment!
Other Cool Science Experiments for Kids
This rainbow Walking Water Science Experiment is one of our most popular science activities!
Try this super simple Oobleck recipe that only requires two household ingredients!
This rainbow skittles experiment is sure to WOW the kids!
You can also make a rainbow of flowers with this super cool color changing flowers experiment !
This pepper and soap experiment is very simple to do, but always engages the kids!
Did you know you can put paper under water and it will stay dry? Give it a try with this keep paper dry under water experiment . The kids love this cool trick!
Explore Newton’s color wheel while making colors disappear with this totally awesome science activity!
Explore chromatogography with this super fun STEAM activity that combines science and art!
This rain cloud jar science experiment give children a chance to explore clouds and rain in a hands-on and engaging way
The kids will get a kick out of this super cool dancing raisins science experiment !
Check out these other science experiments and activities for kids.
This lava lamp science experiment is always a hit with the kids!
If you haven’t tried this magic milk science activity , you have to! It is so awesome and super easy to do.
This leak proof bag science experiment will make your kids jaw drop! It’s hard to believe, but it works.
