Define colors (LaTeX2e unofficial reference manual (November 2018))

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#### 21.3.1 Define colors

Synopsis:

    \definecolor{name}{model}{specification}

Give the name name to the color. For example, after this

    \definecolor{silver}{rgb}{0.75,0.75,0.74}

you can use that color name with `Hi ho, \textcolor{silver}{Silver}!`.

This example gives the color a more abstract name, so it could change and not be misleading.

    \definecolor{logocolor}{RGB}{145,92,131}    % RGB needs pdflatex
    \newcommand{\logo}{\textcolor{logocolor}{Bob's Big Bagels}}

Often a document’s colors are defined in the preamble, or in the class or style, rather than in the document body.

Unofficial LaTeX2e reference manual