prov:value
| - iii) 0.1-10% by weight, based on the diketopyrrolopyrrole of formula I, of a diketopyrrolopyrrole of formula ##STR6## wherein R10, R11, R12 and R13 are each independently of one another hydrogen, Cl, Br, CH3, OCH3, CN or phenyl, and at least one of R10, R11, R12 and R13 is a group
|