I didn't say that MOST have lead, just that lots do.
The comment about crystal glasses was about crystal glasses (drinking vessels, candlesticks, etc), not rods of glass. Crystal is expensive.
"Same applies to lampwork glass..." - Lead helps lampwork glass sparkle, too. It can help glass, in general, sparkle, when it's used in that manner.
"and in helping to form colours" - Lead is used in some glass recipes as a part of creating the glass colour.
These statements are correct. I'm not sure why I have to defend every comment I make.
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