\fontcolor
In the argument of \fontcolor,
#rrggbb is a hexadecimal number. The two digits
rr represent the brightness of red, from 00
(black) to ff (bright red). The remaining digits
gg and bb control the brightness of green and blue,
respectively.
\fontcolor{#ff0000}{R} + \fontcolor{#00ff00}{G} +
\fontcolor{#0000ff}{B} = \fontcolor{#999999}{W^t} ;
\fontcolor{#990000}{R} + \fontcolor{#009900}{G}+
\fontcolor{#000099}{B} = \fontcolor{#444444}{W^t}
More information on these commands may be found in
Sec. 9.1
of the WebTeX documentation.
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