mixed with vodka dry like the other gel colors do?

Maybe today someone knows the answer!!

No. When you mix it with vodka, it separates out into little white chunks and is useless.

You might be able to thin it with glycerin...I don't know.

You're more patient than me, if I wanted to know something on Tuesday, by Wednesday I would have just tried it for myself

I'm not sure if I understand your question, but if you're asking how to whiten icing that's yellowish (from butter), I've read that if you add a little violet it will whiten. I've never tried it, but I read from quite a few people that it works.