Recent Developments in Organic Pigments

Abstract

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.

Pigments, Plastics and Progress

“…The mechanisms by which model anthraquinone compounds catalyse the photodegradation of alcohols and carbohydrates in solution have been elucidated (3)(4)(5)(6)(7)(8)(9)(10). For the sodium anthraquinone-9,1O-disulphonates, the mechanism operative in solution adequately accounts for the photochemical changes occurring when these compounds are applied to cotton cellulose and…”