Bleeding Paper Spooky Halloween science with acids and bases.   email to friend
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If you've ever taken a chemistry class, you probably remember doing experiments with color-changing liquids. While it looked like magic, the secret was something called acids and bases.

Spraying or painting with ammonia (the base) on a special paper called Goldenrod paper will turn the paper red. Let the paper dry, and the carbon dioxide (the acid) in the air will turn the paper back to its original color.