I've got a few of the 'silver colors' on my list of things to look at as time and $$ allow. It doesn't look like there is a lot of information about the actual components of the various glasses out there. BE has a good list and Kugler has a separate "Lead Free Color' section as, I believe, does Satake. I expect that in the future more of the manufacturers are going to want to disclose lead content even if they keep their other color components a close secret. More on the silver colors soon, I hope.
R
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