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method for displaying an bestaendigen, wasserloeslichen schwefelsaeureesters the leukoverbindung of 4, 6 - the other ingredients are - 6 '- methoxy - and - thionaphthenindigos
method for displaying an bestaendigen, wasserloeslichen schwefelsaeureesters the leukoverbindung of 4, 6 - the other ingredients are - 6 '- methoxy - and - thionaphthenindigos