One color scheme is the electronic industry associations:
 
0  Black             5  Green
1  Brown           6  Blue
2  Red               7  Violet
3  Orange          8  Grey
4  Yellow          9  White
 
The rather rotten jingle that helps to remember this that I learned is:
 
Bad Boys Rape Our Young Girls But Violet Gives Willingly
:(
 
Anybody got a better one?
Dennis Morefield
Sideline Beekeeper, Oregon, USA
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