FWIW spider eyes in the grass have changed color on my experience. I must also admit the color is not something I have memorized, just the fact of a color shift depending on perspective/angle of light beam and subsequent reflection that I *see*. And it wasn't an "always" experience for that color shift.@electrycmonk , is most likely correct, depending on the angle of the light, you can see two different colors being reflected back to the viewer.