Patent ID: 6844428

Claim:
A method for dyeing or printing organic substrates comprising the steps of: providing a compound of formula (I) wherein R 1 is H; C 1-4 alkyl or substituted C 1-4 alkyl; X is halogen or —NR 2 R 3 wherein, R 2 is H; C 1-6 alkyl; substituted C 1-6 alkyl or C 1-6 alkyl interrupted by one or more atoms selected from the group consisting of O, N and S; R 3 is C 1-6 alkyl; substituted C 1-6 alkyl; C 1-6 alkyl interrupted by one or more atoms selected from the group consisting of O, N and S or phenyl substituted by one or more carboxy, sulfo, C 1-4 alkyl or C 1-4 alkoxy; or R 2 and R 3 together with the nitrogen atom form a 5, 6, or 7 membered hetero-cyclic ring which optionally can contain more than one heteroatom from the group consisting of N, O and S and which may be additionally substituted by a C 1-2 alkyl-OH group; salts thereof and mixtures of these compounds; providing an organic substrate; and contacting said compound of formula (I) with said organic substrate.