Photographic products and processes

Details Photographic products and processes Photographic products and processes

C - Chemistry, Metallurgy

09

B

C09B 57/00 (2006.01) C07D 307/94 (2006.01) C07D 311/96 (2006.01) C07D 333/78 (2006.01) C07D 405/10 (2006.01) C07D 497/10 (2006.01) C09B 11/06 (2006.01) C09B 11/24 (2006.01) G03C 8/48 (2006.01)

Patent

CA 2090219

2090219 9304403 PCTABS00020 A novel class of bridged indicator dyes is disclosed which possess absorption in the infrared region of the electromagnetic spectrum. These bridged indicator dyes are useful as light-absorbing, pH-sensitive optical filter agents in diffusion transfer photograpic processes adapted to be performed in the presence of ambient light and to diffusion transfer products useful in such processes. These indicator dyes will also find utility in titrations and other analytical techniques and products where pH-sensitive indicator dyes are employed and absorption of infrared is useful.

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