In a pickle

By Cindy Goldrick Firescale is the residue layer of oxides that forms on the surface of metal when it’s heated. At high temperatures, oxygen mixes with the copper to form cuprous oxide and then cupric oxide. Pickle is, at its most basic, a liquid that allows you to quickly and easily remove this oxidation from your metal, especially if you’re soldering bezels and need clean metal for further soldering steps. There are many kinds of pickle. The one you’re likely most familiar with is a sulphuric acid that’s often sold under the brand-name Sparex. It is a dry acid compound …