Many 2D and 3D molecular editors utilize distinctive Jmol color scheme , which can be defined in a legend as such (all colors except for hydrogen are preserved; hydrogen was intentionally made light-gray instead of white):
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Atoms in JMol and in molecular modelling kits follow the CPK Coloring Scheme.
As a basic identification, hydrogen is white, carbon is grey, oxygen is red, nitrogen is blue, sulfur is yellow, and phosphorus is orange.