red letters are orange in the sun

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From: Gerard Jamin (gjamin@isaac.exploratorium.edu)
Date: Wed Jun 05 2002 - 15:19:57 PDT 

Date: Wed, 5 Jun 2002 15:19:57 -0700 (PDT)
From: Gerard Jamin <gjamin@isaac.exploratorium.edu>
Subject: red letters are orange in the sun
Message-ID: <Pine.GSO.4.44.0206051515230.3884-100000@isaac>

All this talk of solar phenoms reminded me of something I noticed
recently: While reading red letters on a white page in the bright, direct
sun, the letters appeared to be orange in color. When I moved the page to
the shade they were red again.
Any ideas what's going on?

Gerard Jamin
Exploratorium

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