Hello Everyone: I have some 24k gold powder which has been slightly
contaminated with small particles of iron. I need gold powder to be
contaminant free so that it can be used in a powder form. I tried to
separate iron from gold powder by putting into a sulfuric acid
diluted with water and let it simmer for about an hour. It didn’t
work. Same thing worked partially on silver with similar situation. I
would be grateful if anyone can help me solve this problem.