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Brown Bronzes for Medals, copper tea-urns

3777.

Carbonate of Iron Bronze. &c. Take a wine-glass of water, and add to it 4 or 5 drops nitric acid; with this solution Beautiful tints are produced by using platewet the medal (which ought to have been powder or rouge. After moistening with wa- After moistening with wapreviously well cleaned from oil or grease) ter, it is applied and treated in precisely the and then allow it to dry when dry impart same manner as the plumbago. (See No. to it a gradual and equable heat, by which 3775.) the surface will be darkened in proportion to the heat applied.