. . "Dyestufis which are represented by the formula: wherein D represents a dyestufi radical selected from the class consisting of azo, anthraquinone, nitro and phthalocyanine dyestuff radicals; x is the pyrimidine ring; n is one of the integers 1 and 2; A is a bridging group selected from the class consisting of -O, -S- and which is attached on the one hand to a carbon atom present in D and on the oth" . .