Understanding the colour palette.

3,177
England
St helens, merseyside, England.
crazybuttocks198
Crazybuttocks19
I dont really get where one starts and one ends.
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I get that letters represent colours. But where do they start? White/black obivously at the top. Where does r1, b1, g1 etc start? What do all the letters represent? I.e. R red, b blue.
 
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