Thanks, I thought I'd read that too but, wasn't sure enough to post it myself.
I will add my 2 cents..
I read the same or similar article(s) pertaining to the ink and it's titanium content..
Studies of ancient inks from the same geographical area and of that time show traces of titanium occurring naturally as well..
IIRC, it was determined to be the same "type" of titanium as well.. i.e., consistent with the chemical composition of that area.. ( northern europe, scandinavia, russia.. )
As I recall, the paper regarding these findings was the last in a series of "fake-not-fake" counterclaims, and at that point, further studies were denied by the owners.. ( some Boston college? )