Even the most trained eyes can miss an errant zinc weight or two, most certainly in a 5 gallon bucket worth of sorting.
A thermometer is the greatest tool, but lacking that, melting to "slump" (not liquid) and fluxing, then skimming dross and clips will harvest the ones you will most certainly miss if you process the scrap in any large quantity, which you should to obtain some modicum of consistency in weight, as cast diameter and hardness.
Dont be in a hurry sorting and dont hurry making clean ingots and the zinc disease is easily avoided.
Dan is pointing you correctly when sorting.
Last edited by HawkI; 04/06/22.
