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Alright this is an old one. I learned this in grade school, they probably don't do it anymore because it involves dangerous chemicals like water. But it's fun ...
Water Laundry Bluing, getting hard to find, it's a suspension of Prussian Blue in water. Salt (table) Clear Household Ammonia Bowl Toilet Paper Roll Core
Mix equal quantities of water, ammonia, salt, and laundry bluing together. Pour solution into a bowl and stand a tp roll in the bowl. Over the next 18-24 ...
Optionally the cardboard, and subsequently the crystals can be colored with drops of food coloring. Other porous materials can also be used such as terra cotta and coal ...
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