That's an excellent video!
It's easy for me to hear and understand him. He uses a mild sulfuric acid solution in the first tank and a mild hydrochloric acid solution in the second tank and he refers to using this method in a black & white desired finish. He does not though, give specifics of the solution regarding ph or percent.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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