Not trying to hijack this thread, but years ago I read an article about colors. Guy took different colored cards into his darkroom, then had people come in, and he flashed light at the cards, different colors, different light intensity, different lengh of time for the light. The color the vast majority of people could pick out with the least amout of light? Blue. Baby blue in fact. So that was the color I painted my front sight (worked a lot of graveyard shifts back then)...