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...I'm printing transparencies on my Epson inkjet printer which I'll then use to expose light-sensitive plates in a UV exposure unit. I'm trying to find out which inks, besides black, would be best a blocking UV light.
Could someone let me know what wavelength UV we are talking about here? There's a potential problem if the "clear" bits of the overhead slide film absorb too much UV. On the other hand there's nothing to say the UV has to be blocked by a pigment like carbon black. A dye would work perfectly well; if it looks black it probably blocks UV too.