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How to make rat poison
Mix a 1/4 pound (113 g) of plaster of paris with 1/4 pound (113 g) of cornmeal in a large bowl.
Plaster of paris can be bought at most craft stores and hardware stores. It is a dry powder made of gypsum that, when mixed with a liquid, thickens and eventually hardens.
Add 1-2 cups (0.2 l to 0.47 l) of milk. You can add more milk if clumps of the cornmeal or plaster of paris are still dry.