Your cursed blood? How is it cursed, and what effects does the curse have on it?

[the good thing about someone breaking in without breaking, he doesn't feel particularly rude asking that. he'd ask anyway but still.]

Fair enough, though of course there are other issues with those bloodtypes I suppose. Freezing, the corrosive nature, etc. [he waves a hand.] Matter to handle as they come. Now, why are you in my lab exactly?