How To Make Slime Colors Of The Rainbow

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 colored slime is perfect for every kid!  Six individual slime colors make the six colors of the rainbow!

OUR BASIC SLIME RECIPE 

All of our holiday, seasonal, and everyday theme slime use one of our four 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.

I will always let you know which basic slime recipe we used in our photographs, but I will also tell you which of the other basic recipes will work too!  Usually you can interchange several of the recipes depending on what you have on hand for slime supplies.

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.

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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!  Our saline solution slime recipe also works well for Australian, Canadian and UK readers.

HOST A SLIME MAKING PARTY AT HOME OR SCHOOL!

I always thought slime was too difficult to make, but then I tried it! Now we are hooked on it. Grab some liquid starch and glue and get started! We have even made it with a small group of kids for a slime party!  This is also a great slime recipe to use in the classroom! 

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!

—>>>  FREE SLIME RECIPE CARDS

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

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:

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 COLORED 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.

If you want to send kids home with a bit of slime from a camp, slime party, or classroom project, I would suggest packages of reusable containers from the dollar store or grocery store or even Amazon. For large groups, we have used condiment containers as seen here.

MORE RAINBOW SLIME 

We also have a fun variation of this rainbow colored slime recipe which uses saline solution instead of liquid starch, as well as sparkly glitter.

Check it out here:   RAINBOW GLITTER SLIME

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!

—>>>  FREE SLIME RECIPE CARDS

We have the best resources to look through before, during, and after making your colored slime! Make sure to go back and read the slime science above too!

MORE SLIME MAKING RESOURCES!

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.

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PLAYING WITH 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, so 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!

MAKE A RAINBOW

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. 

Look how beautifully the rainbow colored slime mixes as we play with it!

 At first the colors are darker. As the different slime mix, the colors run together and lighten.  I love the light coming in through the window. It lit up this colored translucent slime perfectly!

Rainbow Sensory Play Color Play

 Slime is one of our most favorite things to play with over here! He couldn’t believe how heavy our rainbow slime had become! He loved folding it and squeezing it and watching it ooze!

Rainbow slime play

That is a whole lot of rainbow colored slime for everyone to enjoy!

Now 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!

—>>>  FREE SLIME RECIPE CARDS

MORE FUN RAINBOW SCIENCE IDEAS

Grow Your Own Rainbow Crystals

Make A Walking Rainbow

Rainbow In A Jar

Rainbow Activities For Kids

Rainbow Science Fair Projects 

 

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