Adrian LeRoy, who developed the "Lerochrome" one-shot color camera in 1938, did quite a bit of work with "secret" map processes that used fluorescent and phosphorescent color emulsions that were "invisible" unless exposed to UV light. According to the 1946 Industrial Research Laboratories of America , his research included the "subtraction of the visible spectrum colors from uranium nitrate and the application of color photography".

BTW His "Leriomystic" solution, which promised "absolutely invisible pictures", was an early(1927) attempt to commercialize his research in this area.