Color former

A colour former mixture for pressure- and heat-sensitive recording systems containing

• a) at least one 3,1-benzoxazine of the formula ##STR38## in which R.sup.1 to R.sup.5, independently of one another are C.sub.1 -C.sub.4 -alkyl or benzyl whereby the moiety ##STR39## one of the radicals R.sup.6 and R.sup.7 is methyl, ethyl, methoxy, ethoxy or chlorine and the other is hydrogen and
• R.sup.8 is hydrogen, methyl or chlorine;
• b) at least one fluoran of the formula ##STR40## wherein X.sup.1,X.sup.2,X.sup.4,X.sup.5, independently of one another, are hydrogen, C.sub.1 -C.sub.12 -alkyl which may be substituted by C.sub.1 -C.sub.3 -alkoxy, cyclohexyl, phenyl or heterocyclic radicals from the series of nonhydrogenated, partially hydrogenated or hydrogenated furans, pyrrols and pyridines, or is allyl, cyclopentyl, cyclohexyl or phenyl which is unsubstituted or substituted by methyl, methoxy or chlorine, whereby the moiety
• NX.sup.1 X.sup.2 additionally can designate pyrrolidino, piperidino or morpholino and
• X.sup.3 is hydrogen, methyl, methoxy or chlorine;
• and at least one compound from c) or d) wherein
• c) at least one 3,1-benzoxazine of the formula ##STR41## in which Q.sup.1 is hydrogen, chlorine, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,
• Q.sup.2 to Q.sup.4, independently of one another are C.sub.1 -C.sub.4 -alkyl,
• one of the radicals Q.sup.5 and Q.sup.6 is methyl, ethyl, methoxy, ethoxy, propoxy, 2-propoxy or chlorine, and the other is hydrogen, and
• Q.sup.7 is hydrogen, methyl or chlorine;
• and
• d) is at least one lactone of the formula ##STR42## in which Y.sup.1 is C.sub.1 -C.sub.12 -alkyl, benzyl or phenethyl,
• Y.sup.2 is hydrogen, C.sub.1 -C.sub.4 -alkyl or phenyl,
• Y.sup.3 and Y.sup.4, independently of one another, are hydrogen, chlorine, methyl or methoxy, and
• Z is CH or N.