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Etching dates back to the 5th century, made famous by artists like Albrecht Durer. Also called intaglio, etching on metal is typically done by covering a metal plate with a waxy coating and then carving a picture into the plate. The plate is then dipped in a special acid called mordant, eating away at the metal that's not protected by the wax and creating indentations that allow the metal plate to be inked and printed. Instead of bringing hazardous chemicals into your home, your child can explore this ancient art technique with the help of some tinfoil, black paint and the end of a paintbrush!