This when you mix two liquids together and end up with a solid floating in the liquid. The solid is called a precipitate.
We did it when we made the chemical that they put on film. We got a white precipitate which we filtered out. We spread the white precipiate out on the filter paper and put it on the side in the sunshine with a coin over it.
Where the sun reached it, a reaction happened and the chemical went dark grey. Under the coin there was no light and no reaction so it stayed white.
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