| http://www.w3.org/ns/prov#value | - Process according to claim 1, characterised in that dyes of the formula: ##STR79## wherein: A and B have the meaning already indicated, R18 denotes H, OH or NH2, R19 denotes H, halogen, in particular Cl, Br, I or a phenoxy group optionally substituted by Cl, or OH,R20 denotes H, Cl, Br or OCH3, R21 denotes H, OH or NH2, R22 denotes H, OH or NH2, u denotes 1-2, and v denotes 1-4,are used. 5.
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