On a rainy weekend day, we got out the baking soda and made "fizzy colors" by spraying colored vinegar at the baking soda. We put the vinegar in an old contact solution bottle.
The colors fizz up nicely. We had blue and yellow and green dye so we tried all three.
Then we made some foaming dough. We just mixed a little water into a lot of baking soda until it kind of got clumpy and moldable. Then we doused it with vinegar for some very satisfying foamy mess.
And then we mushed and mashed it all together and pretended to make, serve, and taste "ice cream."
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