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pigmentdnipro@gmail.comLead chromates are lead chromates (PbCrO4) with lemon-yellow, yellow, orange, or red coloration. Yellow lead chromates are either pure lead chromate (PbCrO4) or an isomorphic mixture of lead chromate and lead sulfate (PbCrO4-n PbSO4). The color depends on the sulfate content — the higher the sulfate proportion, the lighter the pigment. Main advantages: relatively low cost and high hiding power. Main disadvantages: high toxicity, low color purity, and chemical instability. Examples: – when exposed to alkalis, lead chromates turn red due to the formation of basic lead chromates, making them unsuitable for concrete, plaster, and paving tiles; – when exposed to hydrogen sulfide, chromates darken due to the formation of lead sulfide, making them incompatible with sulfur-containing mate..