Azo, vat and phthalocyanine pigments are discussed briefly. The demand for high‐grade pigments has led to the development of new classes of organic pigments, viz. quinacridone, dioxazine, perylene—perinone, fluorubine, pyrrocoline, and isoindolinone pigments. The preparation and properties of these pigments are discussed, particular attention being paid to the range of colours and the fastness properties obtained and to the prospects of commercial development.
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Nakul Shah (1967) studied this question.
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