We are currently producing a lead wire rod but when drawing, the wire in the wire drawing machine turns a blackish colour. Can any one suggest to me what the resolution is and what type of chemical we should be using in the drawing machine?
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The black color you see on the surface of the lead placed in the drawing machine must be lead sulfide. (PbS) which is also known as galena. en.wikipedia.org/wiki/Lead%28II%29_sulfide This must have something to do with a sulfur compound such as mild sulfuric acid contaminating your drawing solution.
I don't think you will find many experts in drawing lead in this Forums. I was under the impression that lead was hot extruded with a lead press and thus never drawn at all because of its very low tensile strength.