These are the values that i used for the metal colors.  They were gleaned
from a fusion of Web data, household articles, hardware from The Home
Depot, illustrations from metallia.com, and loose change.

#declare c_ALUMINUM = rgb <0.89, 0.91, 0.91>;
#declare c_BRASS_COOL = rgb <0.80, 0.80, 0.35>;
#declare c_BRASS = rgb <0.80, 0.65, 0.30>;
#declare c_BRASS_WARM = rgb <0.80, 0.55, 0.25>;
#declare c_BRONZE_NEW = rgb <0.80, 0.50, 0.25>;  //polished, no patina
#declare c_BRONZE_WARM = rgb <0.45, 0.30, 0.15>;
#declare c_BRONZE = rgb <0.45, 0.35, 0.15>;
#declare c_BRONZE_COOL = rgb <0.45, 0.40, 0.15>;
#declare c_CHROME = rgb <0.61, 0.61, 0.65>;      //duplex Ni + Cr
#declare c_COPPER = rgb <0.80, 0.45, 0.35>;
#declare c_GOLD = rgb <0.95, 0.775, 0.40>;
#declare c_PENNY = rgb <0.80, 0.45, 0.25>;       //"penny bronze" 5% Zn
#declare c_SILVER = rgb <0.96, 0.96, 0.92>;
#declare c_SILVER_COIN = rgb <0.66, 0.63, 0.57>; //75% Cu + 25% Ni
#declare c_STAINLESS = rgb 0.49;
#declare c_STAINLESS_WARM = rgb <0.51, 0.51, 0.47>;
#declare c_STEEL = rgb <0.61, 0.59, 0.54>;
#declare c_ZINC = rgb <0.78, 0.82, 0.80>;

Notes:

 - It appears that bronze can be *almost* *any* color--black, brown, olive,
   gold, green, gray, etc.  My values were pure guesswork.  I can find lots
   of "bronze" items in novelty stores and in The Home Depot, but who knows
   how much of it was painted on?

 - c_CHROME is for electroplated chromium over nickel.  It is not the color
   of solid chromium, which is a rare beast.

 - Freshly minted (American) pennies appear to be the same color as copper
   pipe, but they quickly turn an orange color before the shine even wears
   off.

 - c_ZINC makes a good galvanized texture when used with normal { facets }
   and a low reflection { }.

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