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An ink for marking pens according to claim 1, which comprises a blue dye represented by the formula (IV) ##STR48## wherein each of R9, R10, R12 and R13 is independently --H, --CH3 or --C2 H5, each of R15 and R16 is independently --H, --CH3, --C2 H5 or a phenyl group, and R8 is an alkyl group or a substituted alkyl group of C6 -C18, an ethanol-soluble resin, and ethanol.
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