the question is rather vague, but if you are refering to the fine bronzing powders some of which are gold in colour, they are done with fine filings of bronze metal. the silver is the same...one can also use aluminum powder for silver as it doesn't react to light and tarnish as does silver, however it will oxidize rapidly in water, so must be suspended in a solvent born solution. some with the bronze powders, they go green in water, and must be suspended in a solvent born solution.
how to make them i haven't a clue...i just use them for some rather good looking gold and silver glazing solutions.How to make silver powder and gold powder?
Get some silver and some gold. Grind them up into a powder.
Done.
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