The term goldenrod is typically used to describe a color of paper - golden yellow. However, our goldenrod paper contains a special dye that turns bright red when exposed to solutions that are basic, like ammonia water or washing soda. We'll show you how to use this special color-changing paper to develop a hidden message and make dripping, bleeding paper... complete with your own handprint marked in "blood." It's a great acid/base lesson for the Halloween season.
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from Steve Spangler Science