[Jewelry making - Article 01041] - Re: [Orchid] Showing the grain structure in gold

[jesse brennan]

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    a procedure for metallographic etching of gold can be found in the
    ASM metals handbook volume 8 8th edition  "Metallography, Structures
    and Phase diagrams". It uses a cyanide containing alkaline
    electrolyte: 

	80 grams potassium cyanide
	40 grams potassium carbonate
	50 grams  gold chloride
	water to make 1000 ml

    cell  voltage is 7.5   for 2 - 4 minutes 

Jesse


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