Fender is the resident expert on purple blades if that's what you're going for, so maybe he will give you some advice, bit I've done few myself, and usually get the best results by putting the pot or resistor just on the red, leaving the blue alone. You adjust your shade by adding or reducing current to the red with the pot, then measure the resistance and replace the pot with the appropriate resistor.
If you're trying to make a color changing saber, then the same applies.
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