ZZ medical sells 14x17 Ektascan but you have to buy 500 sheets at a time for about $2/sheet.
Internegative: I thought I would make a positive on the way to an internegative. I got massive over exposure with the shortest times and smallest f stop on my enlarger. YMMV.
The base of the Ektascan is blue as is most XRay film. There is a spectral response curve on the Ektascan data sheet. It is not v red sensitive but super bright LEDs are not 100% red and even so they will fog the film if you make the darkroom too bright.
I'm tempted to buy more but also tempted to make my own emulsions. I guess it is a former chemist who wants to play in the lab thing. The 8x10 fits directly into typical 8x10 film holders. It is notched in one corner but the two sides are obvious under dim red light.
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