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Lead Chromate

Alternate Names: Lead(II) Chromate

Oxide Analysis Formula
PbO 67.45% 1.00
CrO3 32.55% 1.08
Oxide Weight 330.91
Formula Weight 330.91

Notes

In nature lead chromate exists as the mineral crocoite. It has monoclinic brilliant-red to orange prismatic crystals. Crocoite decomposes below 1000 degrees to lead oxide and green chromic oxide.

The brilliant reds, oranges, vermillion, and yellow colours achieved in lead-chromium glazes are due to precipitation of crocoite crystals. However lead chromate material is very toxic.

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Hazards Lead Chromate
Typecodes Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
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