"p.4 a halogen atom, a hydrogen atom or a substituent such as an alkyl group, an alkoxy group, an aryl group, an alkoxysulfonyl group, asulfonylalkyl group and a cyano group; Q.sup.1 a sulfur atom, an oxygen atom, a selenium atom or a substituent such as an ethylene group; and Q.sup.2 a sulfur atom, an oxygen atom, a selenium atom or a substituent such as an ethylene group.Among the dyes described" . . . .