Scientific American 19, 9.5.1863
A solution of the nitrate of silver stains marble black; a solution of cerdigris applied hot stains it green; a concentrated solution of carmine applied hot stains it red; orpiment dissolved in ammonia stains it yellow; the sulphate of copper, blue; and a solution of magenta, purple. The marble should be warmed before ay to these solutions are applied, so as to open its pores and enable it to absorb more of the coloring matter. Marble may be stained according to beautiful design with such colors. This art was more extensively practiced in Italy during former ages than it is at present.
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