Water-soluble sulphur dyes, their preparation and use
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United States of America Patent
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Jan 24, 1995
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N/A
app pub date -
Sep 30, 1993
filing date -
Oct 10, 1992
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Abstract
The black water-soluble sulphur dyes of the formula ##STR1## in which, for example, F is the dye chromophore of C.I. Leuco Sulphur Black 1, R.sup.1 if hydrogen, alkyl, M.sym. is an alkali metal cation and n is such a large number that the dye contains 5 to 20% by weight of COO.sup..crclbar. groups are, inter alia, outstandingly suitable for producing recording fluids.
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