How Do You I.D. Wheelweights?

[TennesseeNuc]

Hi all,
I've never used wheelweights for casting.  Up until now I've used lead, 50/50 solder and lynotype for my mixes.  With print shops going to computers, lynotype is getting harder to find.
I have noted some posts that mentioned getting some wheelweights that contained zink (ugh).
Does anyone know if there is a reliable way to identify lead WWs from the ones with zink?  It would be a shame to contaminate a 20 lb pot of alloy with a couple of bad WWs.
Best,
TnNuc

[Handgunr]

It's simple enough....when all else has melted and one just sits there untouched...it's zinc.
Scrap it off and toss it. Zinc melts at higher temps. than regular WW's do.

If you let the furnace run until the temperatures climb, eventually, the zinc will melt as well. I'm referring to the point where WW's have just melted completely and only leave the clips on the surface. At this point, any untouched WW's that are left, are surely zinc.


Take care,
Bob

[TennesseeNuc]

Handgunr,
Thanks for the reply.  I guess I'd better start collecting wheelweights before they are all zink.
Best,
TnNuc