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Ferric Chloride is nasty stuff AND it stains whatever it touches poop brown --- hands, shirts, jeans ...Much better etchant AND locally available is swimming pool muriatic acid from the home improvement store. Mix it 2 parts water to one part muriatic acid. Throw in about 5% by volume hydrogen peroxide if you want to etch faster.Alcohol is the recommended solvent for magic marker. Don't use the tequila afterwards in a margarita!!
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