| abstract |
Certain azabenzanthrone and diazabenzanthrone dyes have been found A. TO BE PECULIARLY RESISTANT TO SPONTANEOUS HIGH TEMPERATURE DEGRADATION, AND B. TO BE PARTICULARLY USEFUL AS COLORANTS FOR PHOTOGRAPHIC FILM PRODUCTS MADE BY EXTRUDING A DYED POLYESTER FILM BASE. In combination with a green dye such as 1,4-dihydroxy-5,8-di-ptoluidino anthraquinone or 1,4-di-p-butyl anilino-5,8-dihydroxy anthraquinone, which has the ability to inhibit or minimize edge fog in light sensitive film products having a polyester substrate, the red azabenzanthrone or diazabenzanthrone dye is particularly useful in the form of an approximately ''''neutral'''' colored film substrate. |