Quote:
Originally Posted by Heidi von Frozenfyre
The higher the c.o.e the higher the lead content. The brighter the colors the most likely the higher of c.o.e. and lead
The makers of the glass do not need to say the % of lead content if it's under 39%
If it doesn't have lead it's pyrex.
Lead makes the glass flow.
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Pyrex (and other borosilicate glasses) use boron compounds as part of the flux. There are lots of glasses that don't contain lead or boron that aren't Pyrex.
A lot of soft glasses, including Moretti/Effetre, have lead in them. EDP and striking red both contain lead, to name a couple. Many of the metallic reduction effects that are created on glass surfaces are metallic lead that reduces out of the glass (from lead oxide).
Robert