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From: bobr@zeus.UUCP
Newsgroups: comp.graphics
Subject: Re: The color of gold...
Message-ID: <1452@zeus.TEK.COM>
Date: Sat, 28-Mar-87 18:06:03 EST
Article-I.D.: zeus.1452
Posted: Sat Mar 28 18:06:03 1987
Date-Received: Sun, 29-Mar-87 11:46:42 EST
References: <105@titn.TITN>
Reply-To: bobr@zeus.UUCP (Robert Reed)
Organization: CAE Systems Division, Tektronix Inc., Beaverton OR
Lines: 8

Gold, silver, copper, obsidian, etc., are not color per se, but gradients of
colors which reflect the nonuniform reflectance properties of those
materials.  The colors and intensities actually vary with respect to the
angles of incidence and reflection from the light source.  Rob Cook wrote an
informative paper on this subject for a SIGGRAPH conference a number of
years ago.  I can't cite the exact reference but it was before 1982.
-- 
Robert Reed, Tektronix CAE Systems Division, bobr@zeus.TEK