Dying bright red rayon...advice?

[asteria]

I have a long maxi dress that is BRIGHT red. Basically, it blinds people in bright sunlight, so I'm hoping to find a way to dye it dark purple or blue. It is 95% rayon and 5% spandex. I've been told I should use a procion dye, but since dying is mixed by CMY color, I am not sure exactly what color of dye I should buy to get the color I want. Does anyone have any ideas on this? I was thinking a dark blue might work, but since I learned about the CMY wheel and dye, I'm just not sure. Any advice at all, on color, or process, or whatever, would be appreciated!

[Aleks]

Rayon dyes easily, just use fiber reactive dyes

if you used blue it would most likely end up being purple.

You should do a sample first (on a similar fabric or maybe a part of the facing (if you can))

[Heirloom]

the 5% spandex will most probably not be a problem.