Chris L Peterson wrote in message . ..
What you call "violet" on a shirt is probably a radically different spectrum
than the spectrally pure violet you see dispersed by an optical system. The eye
is a very limited color sensor- there are thousands of different "colors" in the
sense that they contain different spectral content, but which look the same to
our eyes.

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Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com


Do you know of any device like a special flashlight or filter that can
create this spectrally pure violet color? I'd like to test how different
people can see it and who really can't... like shining the pure violet
light into a white paper and getting 40, 50, and 60 year olds to look
at it and tell if they can see anything. Just curious.

optidud