Robert, is this a real danger after the bead is made though? Unless you have the bead in your mouth for long periods or you're making a vessel that will contain liquid that could leach the lead out over time, wouldn't it just sit on the surface of the glass.
I would think the biggest danger would be when the glass is molten and the lead is volatilized (big reason to have ventilation) in the flame. I mention this because years ago, Vince cautioned me against fuming glass with EDP. All the pretty colors were the lead coming out of the EDP and depositing on the bead.
ESC
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