I don't know about wine, but blue dye is often used for the colors
black, violet, and blue depending on the concentration of dye. Black
licorice is really a very concentrated blue dye. My guess is that this
is because the colors reflected off of the dye are at the lower limit of
the visible spectrum. As you increase the concentration, less and less
visible light will be reflected.
=David Wheeler
Robert Morris University
Pittsburgh PA
On 2/1/13 2:16 PM, Marc Carter wrote:
Hi, all --
Although this is not directly teaching-related, it will be the next time I
teach color vision.
I have dried-up wine residue in the bottom of a glass, left from the night
before. It's purple.
I put water in the glass to rinse it, and the water has a purple tint.
I pour this into a white enamel sink. It's *blue*.
The sink is as far as I can see not yellowish -- it really looks white.
Any ideas on why this happens? Anyone care to try to replicate this and report
back?
Thanks,
m
--
Marc Carter, PhD
Associate Professor of Psychology
Chair, Department of Behavioral and Health Sciences
College of Arts & Sciences
Baker University
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