I contacted with Eastman House , waited 4 weeks , directed to Motion Film Dep. and directed to RIT Rare books librarian and directed to retired Kodak Research Lab. member.

He says he doesnt believe to salts of sulfonic acid dye theory but inorganic pigments. He says he believes to ferro or ferri cyanides for green but no idea about Red.

He supports Magnesium Alum theory.

He says Capstaff changed the direction to cyan , magenta colors later. ps. I posted his patent numbers.

He says they were applying a bleach to BW Slide and than replace silver with pigments.

He doesnt believe to glue two films together idea.

Umut