| abstract |
A recording-material for colour photography Abstract Compounds of the formula I in which A, R1, R2, R3, R4, R5 and R6 are as defined in claim 1, are effective optical stabilisers for photo-graphic dyes and their precursors. They are added to the colourphotographic recording materials as the latter are being prepared, and, as a result, the developed images have a longer optical stability. |