CPK
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"CPK" stands for Corey-Pauling-Koltun. It commonly refers to a color scheme for the elements that originated in physical models developed by Corey, Pauling and Koltun. In this color scheme, carbon is gray or black, oxygen is red, nitrogen is blue, and hydrogen is white. The command "color cpk" applies this color scheme in popular molecular visualization programs such as RasMol, Chime, and Jmol. The complete set of element colors used by Jmol is available at Jmol Colors, where the colors used by RasMol are compared with those used by Jmol.
A color key such as the one below can be inserted into Proteopedia using existing templates (see Help:Color Keys):
C
H
O
N