| http://www.w3.org/ns/prov#value | - otes a substituent which can be split off under dyeing conditions, in particular --OPO3 H2, --OCOCH3, --Cl, --OSO2 CH3, --S2 O3 H, --OH or, above all, --OSO3 H, Y represents halogen, such as fluorine or chlorine, or an optionally substituted pyridinium radicaland the group SO2 --A is bonded in the 4- or 5-position.
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