Compounds of the formula IMAGE +TR IMAGE wherein R1 is C1-4alkyl, R2 is hydrogen, C1-4alkyl or C1-4alkoxy, R3 is hydrogen or C1-4alkyl, and M is hydrogen or a monovalent non-chromophoric cation, and mixtures of such compounds, stable, concentrated, aqueous compositions consisting essentially of, by weight, 5-20% Compound of said formula in salt form or a mixture thereof 2-25% 2-(2-Methoxyethoxy)ethanol 0-8% Propylene glycol Balance Water, and the use of such compounds, mixtures and stable, concentrated, aqueous compositions for dyeing and printing anionically dyeable substrates such as natural and synthetic polyamides, especially nylon carpet.
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