Salvaging -purifying mixed alloys ?

[J.B.]

Might get a thermometer and run your melt up to 650, anything that's still floating on the top probably isn't pure lead. Scim it off, flux and stir some more..

.. Thanks Don. I will give that a go when I get my bottom pour emptied. Just annoyed me having metal around that I didnt know the ancestorage of and run the risk of putting the wrong metal into a good mix. I cant remember if antimony attaches itself more to tin than lead but believe arsenic and zinc play havoc as well. Obviously less expensive to harden the alloy with antimony etc ..than to add tin...and hence the problem. Thanks for the heads up.