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What is precipitating out as a dark green/blue color?

Question asked by Sorel Nelson on Jun 13, 2019
Latest reply on Jun 13, 2019 by Steven Cooke

I made a synthetic solution, for which I will attach the calculator with all the reagents used, and something is precipitating out as a dark green/blue color. I mixed the cyanide species separately and the other reagents separately. However, once I added them together the solution turned to a dark green color and once I added the sulfuric acid it became even darker. I believe the precipitate has to do with the copper and iron because I analyzed the solution and there was no copper in it and very little iron compared to the amount of compound added. 

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