[Alt-photo] Optical density

Erich Camerling e.camerling at tiscali.nl
Tue Nov 5 12:19:04 UTC 2013

Measuring optical density at 380 nm. ( X-Rite 361T ) will give a lower
measured optical density value compared to 365 nm.
Because alt-photo processes using ammonium ferri-oxalate have their
maximum sensitivity from 313 - 365 nm.I measure at 365 nm.
(340 nm. is the optimum) but 340 nm. UV-LED's are extreme expensive
and many Epson inks have their optimum in the  365 nm.region.

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