[Physltest] [Phys-L] Re: Color (was LED mini-flashlight price break)

[John Denker <jsd@AV8N.COM>]

Bernard Cleyet wrote:
> I've checked two food color dyes w/ my star.  The red has a very sharp
> cut off at 600 so has a bit of orange and all the red to 700 where my
> eye fades out.  The blue is interesting; it's only ~ 50 nm wide ~
> centered on ~ 460 + it passes > 670, so it looks a bit purplish.  I
> haven't bothered w/ the orange and yellow, yet.

Very cool.  I would love to see spectra for the common
FD&C colorants.  I tried googling for them with less than
satisfactory results.

If anybody can obtain the data, and send it to me, I'll
plot it and put it up on the web.
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