Zinc and Lead wheel weights

[Two Flints]

Hello Darksider's Den Posse,

As stated in my previous post I received a good supply of wheel weights for bullet casting.  I have separated the stick-on wheel weights from the clip-on wheel weights.  However, as I took another look at my clip-on lead wheel weights I noticed that some of them have a different surface appearance, almost like a gray paint.  Are these zinc wheel weights? 

Is there any way to determine which are lead and which are zinc wheel weights before doing any melting?  I know they melt at different temperatures, but visually, is there a way of determining zinc from lead wheel weights?  I have seen some zinc wheel weights with the letters zn on the surface; but the ones I am wondering about have no such letters.

Thanks,

Two Flints

[Adirondack Jack]

If they don't melt when the others do, they are zinc or some other goo.  Fish em out with the clips and toss em.

[hellgate]

They are lead alloy that has an enamel paint. Take a file to them and see if you can't scrape them with an awl or other sharp tip to see if they are harder than the other WWs. If they are significantly harder they could be Zn but I remember filing them and determining they were Pb.

[rickk]

The zinc weights will float to the top and be stubborn about melting. If one seems hard to melt, scoop it out and toss it.

[Dick Dastardly]

As much as possible, you don't want zink in your boolit alloy.  I'm lucky cuz I encounter almost none from my supplier of wheel weights.

DD-DLoS

[john boy]

To preclude the Zinc WW's Syndrome ... just keep your melt temperature at 650 degrees.  Anything floating is not lead!   It's that easy