Oxide removal from copper, brass, bronze, nickel silver and other copper alloys containing high percentages of copper. 10 to 25% hot sulphuric acid with 5 to 10% potassium dichromate added. Pickling can be done at same time flux is removed. Will work on carbon steels, but if pickle is contaminated with copper, the copper will plate out on the steel and will have to be removed…
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