Coloured Inorganic Phosphate Pigments

Apart from their anti-corrosive action on metals (Section 12.7), inorganic phosphates have found only limited application in protecting or colouring other materials [1]. 

Cobalt orthojiiosphate Manganese ammonium pyrophosphate Zinc phosphate Lead phosphates 

Like silica, AIPO4 and BPO4 can act as host lattices for small charge-balanced quantities of other metal oxides, forming isotypic mixed phases which are highly coloured, but apparently of limited pigmentary value. 

Mixed-cation tetrametaphosphates Zn2 cNi P40i2 and also Co2 cCa jP40i2 have 

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