Hello Chris ,

Are you aware of many early red, green and you call azo emulsion sensitizer dyes are used in original autochrome screen starch dyeing recipe. Its would not be a suprise to find them in autochrome panchromatic RRGGBB screen backing emulsion.

Very important finding I think.

Thank you for hard work , try to contact with Ukraine and obtain their price catalog. They are very Soviet times prices.

Umut