Thank you for that comment regarding Mercuric Chloride. I make my own browning solutions using a formula out of Angier's book, minus the Mercuric Chloride. I find that with a high polish and being careful of time, temp and humidity I can get a nice high luster finish without the very fine micro-pitting. A high polish is required as well. I have no experience with the earlier formula's contain the more toxic ingredients but what you say makes perfect sense. I have found that with the formula that I use, even without the MC I need to reduce the strength of it. It appears the original formulas were very strong indeed.

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