Roy G Biv

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Over in the good ol' U of K we memorized "Richard Of York Gave Battle In Vain"

Yep, that's the color coding used in telephone cables btw.

Resistor codes are just a teensy bit different,

Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Grey, White, Gold and Silver.

One if it's many mnemonics:

Bad boys rape our young girls but Violet gives willingly.