Hey Magenb! I am getting a few grey hairs already, yet even I don't remember such paint
I guess it should be pre-2000.
Anyway, I definitely wouldn't recommend highlighting deep purple with white, especially if you're planning to drybrush - it would look too chalky. It's better to start with something with colour in it, like pink horror - and then, if you feel like it, you may go for a second super-light pass with pure white.