Color Mixing with Slime

When we think of slime, we think of a super-fun gooey experience. But with a handy bag, we can create an awesome rainbow project that lets us enjoy slime and learn at the same time! In this experiment, we make slime in the three primary colors (red, yellow, and blue) and layer them up to produce secondary colors (orange, purple, and green).

  1. Ages: 3 - 8

  2. <30 minutes

  3. A little messy

  4. Grownup needed

Step-by-step tutorial

  • Step 1

    Gather your materials.

    Photo reference of how to complete step 1

  • Step 2

    For each color of slime, place an open bag over the mouth of a glass. Add a ½ cup of clear non-toxic glue to each bag (avoid filling the bag beyond half its size).

    Photo reference of how to complete step 2

  • Step 3

    Add a ¼ cup of water to each bag, then mix the glue and water together with a craft stick.

    Photo reference of how to complete step 3

  • Step 4

    Add in 1 to 2 drops of food coloring to each glass. Stir the mixture until the color has evenly dispersed.-To make red, add 2 drops of coloring.-To make yellow, add 1 drop of coloring.-To make blue, add 2 drops of coloring.

    Photo reference of how to complete step 4

  • Step 5

    Add a ½ teaspoon of baking soda to each glass and stir the mixture until it has dissolved.

    Photo reference of how to complete step 5

  • Step 6

    Add 1 tablespoon of contact solution to each color.

    Photo reference of how to complete step 6

  • Step 7

    Stir each mixture. You’ll see and feel the slime start to come together. It will become less sticky and more slime-like!

    Photo reference of how to complete step 7

  • Step 8

    Carefully remove the bags from the glasses and seal them. You should now have 3 separate bags, filled with red, yellow, and blue slime. Overlap two bags at a time. What colors can you create?

    Photo reference of how to complete step 8

  • Learn moreMagnifying graphic

    When you overlap your bags, you can see the two primary colors blend together to form a new color. These are secondary colors. Try creating all three! red + blue = purple blue + yellow = green yellow + red = orange. If you want to take the colors a step further, repeat the activity to create slime in each of the secondary colors and place them in their own Ziploc bag. Now try mixing and matching the primary and secondary colors with one another. Overlap these bags and see what new colors you can create!

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