Etching Liquid for Steel.
Mix 1 oz. sulphate of copper, one-half oz. of alum, and one-half a teaapoonful of salt reduced to powder with 1 gill of vinegar and 20 drops of nitric acid. This liquid may be usedfor either eating deeply into the metal of for imparting a beautiful frosted appearance to the snrfaco, according to the time it is allowed to aot. Cover the parts you wish to protect from its influence with beeswax, , tallow, or some similar substance.
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https://paperspast.natlib.govt.nz/newspapers/WT18840112.2.25.11
Bibliographic details
Waikato Times, Volume XXII, Issue 1797, 12 January 1884, Page 2 (Supplement)
Word Count
81Etching Liquid for Steel. Waikato Times, Volume XXII, Issue 1797, 12 January 1884, Page 2 (Supplement)
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