Rainbow slime is amazing!  This beautiful colored, shimmery rainbow slime is perfect any time of the year.  Rainbows are magical and well, we think slime is too!  Everyone needs to try making homemade slime at least once, and this is it!  Our easy to make rainbow slime recipe is perfect for every kid!

COLORFUL RAINBOW SLIME Rainbow Slime Colored Slime Mixing Activity

OUR BASIC SLIME RECIPE 

All of our holiday, seasonal, and everyday theme slime use one of our five basic slime recipes that are super easy to make! We make slime all the time, and these have become our go-to favorite slime making recipes.

Here we use our Liquid Starch Slime recipe.  All you need to make this colored slime with beautiful rainbow colors is clear glue, water, and liquid starch.  If you can’t get your hands on clear glue, try white PVA glue!   Though your rainbow slime might be a bit more on the pastel side depending on how much food coloring you use.

Now if you don’t want to use liquid starch, you can absolutely test out one of our other basic recipes using saline solution or borax powder. We have tested all three recipes with equal success!

ALSO TRY OUR RAINBOW SLIME RECIPE WITH SALINE SOLUTION

THE SCIENCE BEHIND SLIME 

What’s the slime science all about?  The borate ions in the slime activators (sodium borate, borax powder, or boric acid) mix with the PVA (polyvinyl acetate) glue and forms this cool stretchy substance. This is called cross-linking!

The glue is a polymer and is made up of long, repeating, and identical strands or molecules. These molecules with flow past one another keeping the glue in a liquid state. Until…

You add the borate ions to the mixture,  and it then starts to connect these long strands together. They begin to tangle and mix until the substance is less like the liquid you started with and thicker and rubberier like slime! Slime is a polymer.

Picture the difference between wet spaghetti and leftover spaghetti the next day. As the slime forms, the tangled molecule strands are much like the clump of spaghetti!

Is slime a liquid or solid?

We call it a Non-Newtonian fluid because it’s a little bit of both!  Experiment with making the slime more or less viscous with varying amounts of foam beads. Can you change the density?

Did you know that slime aligns with the Next Generation Science Standards (NGSS)? 

It does and that means you can use slime making activities to explore states of matter and its interactions. Find out more below…

Rainbow Slime Recipe Spring Sensory Play

OUR RAINBOW SLIME

My son loves to help measure and mix the slime ingredients but prefers to wait for the less messy end product. Our rainbow slime, once made, is not sticky or messy!

The mixing is, that’s my job. We played with the slime colors individually and talked about colors mixing.  He could not wait to mix the rainbow slime together!

We were able to stretch out the rainbow slime colors and place them next to each other to build a rainbow. At this point, the slime colors could easily be separated. Once the real hands on play started, the colors really started to mix in beautiful ways. 

  CLICK HERE FOR YOUR FREE SLIME RECIPE CARDS!

Rainbow Sensory Play Color Play

RAINBOW SLIME RECIPE

I always encourage my readers to read through our recommended slime supplies list and How To Fix Slime Guide before making slime for the first time. Learning how to stock your pantry with the best slime ingredients is easy!

YOU WILL NEED (PER COLOR)

  •  1/2 Cup of Elmer’s Washable PVA Clear Glue
  • 1/4 Cup of Liquid Starch
  • 1/2 Cup of Water
  • 2 bowls and a spoon for each batch {or wash as you go}
  • Food coloring

HOW TO MAKE RAINBOW SLIME

STEP 1:  In a bowl mix 1/2 cup water and 1/2 cup of glue (mix well to combine completely).

STEP 2: Now’s the time to add food coloring!  (See below for tips on how to make the rainbow colors)   Remember when you add color to white glue, the color will be lighter. Use clear glue for jewel toned colors!

Mix the color into the glue and water mixture.

STEP 3: Pour in 1/4 cup of liquid starch. You will see the slime immediately start to form. Keep stirring until you have a gooey blob of slime. The liquid should be gone!

STEP 4:  Start kneading your slime! It will appear stringy at first but just work it around with your hands and you will notice the consistency changes. You can also put it in a clean container and set it aside for 3 minutes, and you will also notice the change in consistency! 

REPEAT FOR EACH COLOR OF THE RAINBOW!

SLIME MAKING TIP:   We always recommend kneading your slime well after mixing. Kneading the slime really helps to improve it’s consistency. The trick with liquid starch slime is to put a few drops of the liquid starch onto your hands before picking up the slime.

You can knead the slime in the bowl before you pick it up as well. This slime is stretchy but can be stickier. However, keep in mind that although adding more liquid starch reduces the stickiness, and it will eventually create a stiffer slime.

RAINBOW SLIME COLORS

Rainbow Slime Colors of The Rainbow Activity

I used 4-6 drops of food coloring per batch. The red and green colored slime required the largest amount of food coloring.

What Two Colors Make Orange:  To make the secondary colors I mixed three drops of yellow and two of red to make orange.

What Two Colors Make Purple:  Purple was three red and two blue drops.

Green was it’s own color but needed 5-6 drops. You can play around with the colors as you like. Our red was on the lighter side, but he wanted it that way!  I love how clear glue makes this rainbow slime shimmer and shine.

Beautiful, translucent slime colors for a shimmery, bright colorful rainbow slime!

Rainbow Slime Colors

STORING YOUR RAINBOW SLIME

I get a lot of questions regarding how I store my slime. We use reusable containers in either plastic or glass. Make sure to keep your slime clean and it will last for several weeks. I love the deli-style containers in my slime supplies list.

Rainbow Slime Sensory Play

No more having to print out a WHOLE blog post for just one recipe!

Get our basic slime recipes in an easy to print format so you can knock out the activities!

  CLICK HERE FOR YOUR FREE SLIME RECIPE CARDS!

HOW TO MAKE THE BEST SLIME

You will find everything you ever wanted to know about making homemade slime right here, and if you have questions, just ask me!

Did you know we also have fun with science activities too?  We also love to experiment with all kinds of simple to set up science experiments and STEM activities.

MORE FUN RAINBOW IDEAS…

MAKE RAINBOW SLIME FOR A FUN COLORFUL SLIME

Click on the link or on the image below for more fun rainbow science activities for kids.

Rainbow slime and rainbow stem science projects

18 Comments

  1. I am not sure what that is but if it’s in the laundry section and does contain borax solution.

  2. Great ideas but there were so many ads that made it too slooooooooooow! I almost gave up!

  3. I use the McCormick food coloring from the spices section of the grocery store. Nothing fancy!

  4. I will check with my ad network. Thanks for the heads up. I don’t have complete control of what ads show up when and where. Please keep in mind that the ads are how I make a living and care for my family.

  5. We have not found it to stain but we play with it on plates. If you use an excessive amount of food coloring hands can get stained for a little bit but it washes out. It could potentially stain rugs, furniture, or clothing I suppose though we have not experienced these issues.

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