Sparex Pickling Compound 10oz. New Easy to Ship Packaging Easy to use, for removing Fire Scale from Gold, Silver, and Copper, after Soldering. Sparex is a non-flammable granular compound, and mixes with water. Mix about 1 Teaspoon of Sparex per 1 cup of water, preferably in a crock pot or our SO584 Hot Pot. Heat to about 180* and it's ready to work. Use Copper Tongs to remove items from the Pot. Size: 10 ounces