. . "toms, R2 is selected from OH, NH2 or SH; R3 is selected from a lower alkyl group containing from 1 to about 9 carbon atoms, cyanoalkyl, acetoxyalkyl or ##STR35## wherein R1 and R2 are as given above; R4 is H, CF3, a lower alkyl group containing from 1 to about 9 carbon atoms, Cl or Br and n is 0 or an integer from 1 to about 125; R5 is an aromatic or heteroaromatic containing group, said colorants" . .