There are several ways to get a purple as my friends @ vader's vault know better than anyone. It all depends on a lot of variables.
1. How do you plan to drive it. US,CF,Corbin,Buck Puck, MR or Hasbro?
2. What is your power source solution. 4.5 AA, AAA, 2 14500's or 12 AC delco in DJ case.
3. What LED are you using. and what are the specs for the RED and the Blue.
4. and of coarse what shade are you looking for.
You could be instructed on one way of achieving a certain shade like Invisas1979 pointed out, however if you drive it differently, have a different RGB or even just one of the LED's in the RGB be different or any other of multiple combination of differences to the list above and the changes can go from subtle to drastic. I have done a few Purples and I can tell you that none are exactly the same. And ever time I just had to play with the set up until I got what I was happy with.
I don't do parallel RB setups anymore either.
Just my worthless $0.02
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