"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
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Mixed crystal pigments of the anthanthrone series and preparation and use thereof Mixed crystal pigments of the anthanthrone series formed from two or more compounds of the formula I ##STR1## where R1 and R2 are each hydrogen, c...
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Process for the preparation of pigments of the anthanthrone series of the formula ##STR1## in which R1 and R2 denote chlorine, bromine or iodine atoms or C1 -C4 -alkoxy groups, having valuable properties, w...
|4018791||Process for the preparation of highly pure halogenated phthalocyanine pigment|
A process for the preparation of highly pure organic pigments which comprises converting organic dyestuffs having various degrees of purity into dyestuff salts capable of being isolated by means of suitable acids which dissolve the impurities contained in...