A compound of formula

##STR00001## wherein V, W, X and Y represent N or CH, at least one of V, W, X and Y being N and at least two of V, W, X and Y being CH; and R.sub.1, R.sub.2 and R.sub.3 are each independently of the other hydrogen, C.sub.1-C.sub.8alkyl, C.sub.1-C.sub.8alkoxy, nitro, cyano, trifluoromethyl, halogen or hydroxy; with the proviso that the compounds of formulae

##STR00002##

are excluded, provides good lightfastness properties to textile fibre materials, in particular PES fibre materials.

A processing fluid contains a resin having an amino group and an amine value of from 200 to 1,200 mgKOH/g and a polyvalent metal salt, wherein the proportion of the resin to the processing fluid is from 0.01 to 10 percent by mass and the processing fluid is applied to the fabric.

A processing fluid contains an alcohol having an amino group and a polyvalent metal salt, wherein the processing fluid is applied to fabric.

The present invention provides the use of fibres comprising one or more composite filaments of cellulose and cellulose acetate, as a bleach activator.

The present invention provides a coloured fibre comprising one or more composite filaments of cellulose and cellulose acetate, wherein the colour is effected by a disperse dye.

The present invention provides a coloured fibre comprising one or more composite filaments of cellulose and cellulose acetate, wherein the colour is effected by a disperse dye.

A compound of formula ##STR00001##
wherein V, W, X and Y represent N or CH, at least one of V, W, X and Y being N and at least two of V, W, X and Y being CH; R.sub.1, R.sub.2 and R.sub.3 are each independently of the other hydrogen, C.sub.1-C.sub.8 alkyl, C.sub.1-C.sub.8 alkoxy, nitro, cyano, trifluoromethyl, halogen or hydroxy; and the compound provides good lightfastness properties to textile fibre materials, in particular PES fibre materials.