Can you dye yellow fabric purple without stripping the colour first?

I have a bright yellow dress that I want to dye purple using dylon washing machine dye in 'intense violet'. I don't want to have to strip the colour first because the dye says not to use it on bleached fabric and if I have to buy pre-dye (their gentler, acceptable colour stripping concotion) it ends up working out too expensive to bother.

My research has come back with conflicting answers; some say as long as the shade you're starting with is lighter than the shade you're dyeing it, you're ok. Others say you'll end up with whatever you'd usually get by mixing the two colours (and if I remember my primary school paint mixing lessons correctly, yellow and purple give you brown--which I definitely DON'T want). Can anyone provide any enlightenment?
 
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