QUOTE (Eternally Noodling @ Sep 3 2008, 10:46 PM)

Turn on a black light and look at the color then. The scene before the desert crossing in David Lean's "Lawrence of Arabia" has a glint of the sun just before it passes the horizon...when gravity bends the light slightly to alter its color.
Sorry about being pedantic, but atmospheric refraction (like a lens) is what causes such colorful effects. In fact, the amount of refraction on a typical day (it varies) is so extreme that by the time the bottom edge of the Sun visibly touches the horizon, in reality it has just completely set!

That's right, while the Sun may be visible, it is actually below the horizon.

Freaky, huh? This phenomenon has to be taken into account while making astronomical observations near the horizon, of course.
While gravitational lensing is a real phenomenon, it cannot practically be observed in this manner. I don't think that it would produce any color effects, either.
QUOTE (Eternally Noodling @ Sep 3 2008, 10:46 PM)

This results in a brief moment of emerald green on the ocean....but in the dry desert it results in the color you see in that ink when one turns on the black light...
I have to say, I love your sources of inspiration!

When I first saw Borealis Black and the reasoning behind it, I thought "Wouldn't it be neat to do the reverse and have the colors of the various emission spectra as individual inks?" Auroras actually consist of light from relatively few and extremely narrow portions of the visible spectrum emitted by atoms and molecules in the upper atmosphere that get "excited" by collisions with energetic particles from the Sun. For example, one of the most prevalent of such emissions is that of atomic oxygen, at a wavelength of 5577 Å (a very specific shade of green). Interestingly, this light is also the primary component of a constant glow that is present even in the blackest of night skies out in the wilderness, known as airglow. It is essentially a faint, global, eternal aurora of which nearly everyone on the planet is completely unaware.

Another interesting emission is the "forbidden line" of doubly-ionized oxygen (O
2+ or commonly OIII) at wavelength 5007 Å, which is the primary color of most types of nebulae. It's not "forbidden" because the Pope said so

, but because it supposedly cannot happen but does anyway because of the nature of quantum physics. No lab equipment on Earth could ever generate a vacuum strong enough to allow this type of emission to occur, but it happens all the time in nebulae. In fact, many amateur astronomers use extremely sophisticated narrowband "OIII" filters to enhance their views of nebulae. Other common wavelengths of celestial light so emitted can be found in the red, violet, and other ranges of color.
All of this stuff is probably far too esoteric to ever find a market, but I mention it to further demonstrate to people that inspiration for colors can even come from unimaginable--nay, astronomical--distances, as well as the geekiest kind of scientific knowledge.