It's weird how frequently interesting chemistry can be found when you're open to finding it in the wild. Take, for example, this post from Katydid, a former student of mine. The color-changing nature immediately made me think of acid-base indicators, and the note toward the end of the ad copy, "make new solutions with vinegar or baking soda" pretty well locked down my assumptions.
I'm not sure what non-toxic, color-safe indicators are being used (pink to yellow, blue to pink, other color combos), but I'm feeling safe with my indicator assumption.
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