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stable, concentrated solutions of anhydrous alkaline azo, methin -, di - and triarylmethan, acridine, azin, oxazin, thiazin, xanthen and anthrachinonfarbstoffen
stable, concentrated solutions of anhydrous alkaline azo, methin -, di - and triarylmethan, acridine, azin, oxazin, thiazin, xanthen and anthrachinonfarbstoffen