A quick question that I hope that one of the group has an answer to (PE maybe?).
Years ago, I used the ruby red 616 for masking with Kodalith and other films. My concern is applying it to another application and for that I need to know a certain specification for it--namely if a pure white light source were to be projected through it, what would its color output be in nanometers within the visible spectrum?
It's arcane trivia time!