Question

what is blact
gold how it for formula ​

Answer 1

Answer:

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To form a black gold alloy , gold is mixed with another metal such as cobalt , usually to the ratio of 3 parts gold to 1 part metal .However, although this is called an alloy it is not really one. The black layer is only on the surface unlike other alloys where the metals are combined.

Black coloured gold can be produced by various methods : patination by applying sulfur -and oxygen -containing compounds.

Plasma- assisted chemical vapor deposition process involving amorphous carbon.

Controlled oxidation of gold containing chromium or cobalt .

(e.g. 75% gold , 25% cobalt )

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