I am in the process of hand sorting many pallets of used wheel weights. Literally tons of material. So far it's about 60% (by volume - not weight) steel and the rest clip on lead and stick on lead with a very small percentage of zinc. Now, being human and far from infallible, I'm sure a little bit of steel has ended up in the lead buckets and a little bit of lead has ended up in the steel buckets. But it's the zinc that bothers me. What if a little bit if zinc ends up in the lead buckets? Is a litttle bit going to make any difference? Or is it like being a little bit pregnant -- that batch is ruined?