Well, red-blue-yellow=black. I would say use red-blue-yellow with a little less yellow to get the more purple color. (since red-blue=purple)
Hmmm, that's tough. Maybe burgundy plus a little violet? Or red and a little black and some violet?
deep violet with black
I have used CHefmaster Violet as the base. Would need some black to darken it.
And then some red deep red to brighten it.
Thanks everyone! I may try each of your suggestions to see the color i get. I really want to make this work especially if i can get the proper color.