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Clearing pyro stains Vanadium, iron, and copper toning processes Excellent for cleaning trays
HCl in water
A satisfactory substitute for HCL is a mixture of sodium bisulfate and sodium chloride. Mix twice as much sodium bisulfate to sodium chloride to make the substitute. Use four times as much of substitute as hydrochloric acid required in a formula.
Note:Poisonous; irritating vapor; corrosive. always add the hydrochloric acid to the water slowly, stirring constantly. Never add the water to the acid; otherwise, the solution may boil and spatter the acid on the hands or face, causing serious burns. Always use a face mask and eye protection.