Colorful Goo Bags

This is great activity to teach Primary and Secondary colors. Even adults have fun squishing the goo in the bag…I found myself playing with it during nap time!

Age: 2 and up, but most interesting for 4 and up


  • 1 cup cornstarch
  • 1/2 cup sugar
  • 4 cups cold water
  • medium saucepan
  • spatula that can withstand heat
  • 3 mixing bowls
  • food coloring (red, blue, yellow)
  • Freezer Ziploc bags (6-8)
  • Duct tape
  • marker


  1. In a medium saucepan, combine the cornstarch, sugar and cold water. Stir and heat over medium heat. In about 5 minutes, it should begin to thicken, continue to stir constantly. Once it starts to thicken, remove from the heat and stir for 1 more minute, until it has the consistency of pudding. Separate the mixture into three bowls. Cool for 30 minutes.
  2. Add red food coloring to one bowl, blue to another and yellow to the last. Explain or review that these three colors are the Primary Colors and that they can be combined to make Secondary Colors.
  3. Spoon some of the red goo into a bag with some of the blue goo and zip it up, then reinforce with duct tape. Write the two colors names on the bag and ask children what color they think it will make. Have them squish the goo to find out! Repeat with all of the colors. Have fun!

About Sarah Lundgren

child of God. married to my best friend. mommy of 4 treasures. at home with my babies.

3 responses »

  1. fun idea… i'm going to try it with finn this morning!

  2. I love this blog, Lindsey! I always need ideas to keep Lute entertained 🙂 This is perfect!

  3. Thanks guys! Rach – what did Finn think? Wasn't it fun squishing it around?!


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