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The synthesis, characterisation and properties of some polycyclic barbiturate pigments are described. The pigments have been tested as colourants for plastic and paint and the results of lightfastness, heatfastness and contact bleed tests are reported. Results suggest that only the barbiturate pigments with large aromatic moieties such as the pyren-1-yl and fluoren-2-yl substituents have good lightfastness...
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