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Krista Rao blogs about crafty adventures with her kids

I save bottle caps. There, I said it. I save them for a variety of projects that I never really get around to… until now.

This weekend we used a very small portion of my caps to make watercolour cakes. As with my other tutorials, this is a very easy craft that you can make along side your kids and provides a lot of fun for everyone.

What you need:

  • 1 tbsp clear vinegar
  • 1 tbsp baking soda
  • 1 tbsp cornstarch
  • 1/2 tsp corn syrup
  • food colouring
  • bottle caps

Step 1: In a bowl, mix vinegar and baking soda… yay! Itʼs going to start bubbling and fizzing.
Step 2: When the mixture stops fizzing, add cornstarch and corn syrup.
Step 3: Blend the mixture together.
Step 4: Pour even amounts of the mixture into each of your caps (we used six of different sizes and still had a bit of mixture left over)
Step 5: For each cap blend in a few drops of food colouring. (brighter colours= more food colouring)
Step 6: Start painting right away or let sit overnight to dry into cakes. Once dried, you can just swirl a wet paintbrush into each cap and start painting.


Krista Rao is a stay-at-home-mom of two. When she and the kids aren’t on some sort of craft mission, she’s making children’s items from reclaimed materials. Check out more of Krista’s adventures at Green Thimble.

Photos via Krisa Rao

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