I was pouring an unknown alloy this morning and am concerned. What happened is the spru on my 6 banger just breaks and looks chrystalized. (Don't dis me if that is spelled wrong.) This is and the boolits are very frosted. I know I was pouring a little too cool because I checked with my new thermometer so I upped the temp. Some of the spru off-fall can be broken easily with one bend and others hold together or it just breaks when it hits the. I bet is is an alloy with very little lead in it.