| 摘要 |
A dye solution composition containing a black dye obtained by the action of at least one acid or its salt: HO(CH2)nSO3H, Cl(CH2)nCOOH, Br(CH2)n COOH (n=1 or 2) on one or a mixture of dyes of the formula (I): <IMAGE> (I) wherein R is phenylene or naphthylene residue; X and X' are each H, sulfonic acid group or sulfonate group; Y and Y' are each H or alkali metal; R' is one of amino group-containing radicals: <IMAGE> <IMAGE> (the carboxyl group may be carboxylate group and the sulfonic acid group may be sulfonate group), except that when R' has not sulfonic acid group, X and X' are not the same and when R' has sulfonic acid group, X and X' are H. This is highly stable, preservative and water soluble, and is useful as ink composition for ball-point pen and ink jet recording.
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