Quote Originally Posted by wogster View Post
They coat RA4 emulsion on a film base.
You can't simply coat the emulsion layers of color print material on a transparent base to make a transparency.

Color print dyes 'get 2 shots at the light' when viewed (light passes through the dyes - hits the base - and is reflected back through the dyes on its way to your eyes) and would make a pretty 'weak' transparency. In addition, color print materials have much lower maximum densities than transparencies (it would be wasted because of front surface reflections of prints).

There WERE Kodak products in the past designed to make display transparencies from color negatives.