The photographer explains the technical process to his friend Harry. Uelsmann specifically discusses his use of Cronapaque which, apparently, “Harry” introduced him to. Uelsmann says “how important Cronapaque has become in my darkroom play.” He discusses the “Floating Trees” image on the reverse saying “the pea pod in water was introduce [sic] with Cronapaque” and continues, “was photographed on a black background… then printed on Cronapaque so that the positive pod appeared near bottom and rest of the Cronapaque is black….” He gives a full explanation of how he uses the “Cronapaque mask.”.
Cronapaque, a trademark of the DuPont de Nemours company (patent filed 1959), is a translucent graphic arts film [contact us for source] . Uelsmann ends with “Diane and I both hope this letter finds you in good health,” and signs, “Friendly thoughts, Jerry.” Diane [Diane Farris, the photographer] was Uelsmann’s second wife whom he married in 1975. Some soiling on margins and bend on one corner, otherwise very good condition.