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.

By Tony Hansen
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