| http://www.w3.org/ns/prov#value | - An orange ink for marking pens of the present invention comprises an orange dye represented by the formula (II) ##STR4## (wherein R4 is --H, --CH3 or --Cl, R5 is --CH3 or --C2 H5, R6 is --H, --CH3, --C2 H5 or a phenyl group, R7 is --H, --CH3 or --C2 H5, and R8 is an alkyl group or a substituted alkyl group of C6 -C18), an ethanol-soluble resin, and ethanol.
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