CPK Coloring is a way to color atoms when visualizing molecular models, inspired by CPK plastic molecular model kits by Corey, Pauling and Koltun. The method uses the van der Waals radii to visualize atoms. CPK coloring conventionally depicts hydrogen as white, carbon as black or grey,nitrogen as blue, oxygen as red, phosphorus as orange, and sulfur as yellow. Other colors that are not always standard include green for magnesium, green for chlorine, orange for iron, and pink for unknown elements or those with atomic numbers over 57.
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