Well, you can't get "Black Titanium", it's coated, which IMO makes the idea of using Titanium pointless.
John Lopez knows more about metals than I do, he'd be the best person to ask.
But I've always thought that coloured metals should only be worn in healed piercings.
And if you DO get it in the future, coloured metals do fade with time.
I'll come back in a few minutes, just wanna check a couple things on BME for you.
ETA: Damn I can't find the article I was looking for, sorry.
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"My name is Butters, I'm 8 years old, I'm blood type O and I'm bi-curious! And even that's okay, because if I'm bi-curious and I'm somehow made from God, then I figure God might be a little bi-curious himself!" Leopold "Butters" Stotch.