if I inject blue paint into myself, will my blood turn purple?

That would make a great pay per view stream. Contact TLC Science or set up a Patreon account, and I'm sure people will flock there to see the show! 

I wonder how many total imbeciles are going to ask infantile questions before Verizon finally close the doors on their insensibility?

Sure, just before you die.

Deoxygenated blood is already purple. 

try it and seeand then you'll know

No. But you could end up dead.