I guy at work just gave me a bunch of clean lead, in ingot form. The problem is that I have no idea what kind of an alloy it is. It supposedly came from a rubber stamp manufacturing facility, and was melted down, fluxed, and poured into ingots. It is bright silver in color, and when you tap the ingots together they made a bright "clink" sound. The end of one of the ingots has been melted and appears to have kind of a grainy texture to the melted part.
Any opinions on what I have here? When I scratch it with a finger nail, it leaves a scuff mark but not a definitive "scratch" in the surface.