Has anyone tried to use x-ray film for the creation of masks? I was thinking of the single-side emulsion type such as Kodak SR45. Most radiography films are double-side emulsions for the additional speed. Single-sided films are used for high-resolution work. This material appears to be cheaper than orthochomatic films (how long will these be available?). The prices that I've seen for film would be around $75 for 100 14" x 17" sheets. Also, the film can be handled under safelight conditions which will help in the process of making the masks. Fuji, Agfa, and Kodak still manufacture x-ray films. The only problem that I see is the films are high contrast and the development will have to be adjusted for this.