The inks of the Vinland map

Those who have followed this saga know that even though the parchment has been carbon dated to 1434, questions have persisted about the ink, with suggestions that it is modern and that the map must therefore be a forgery. New evidence from the Smithsonian Institute will be published in the Dec. 1 edition of Analytical Chemistry, a peer-reviewed journal of the American Chemical Society, the world's largest scientific society:

She used archaeological reports to show that the presence of copper, aluminum and zinc — all found in the Vinland Map's ink — would be consistent with medieval production methods from green vitriol. Additionally, these elements raise serious doubts about the possibility of forgery, because 20th century iron gall inks would not be produced using medieval hydrometallurgy, which is responsible for the presence of these elements. No forger in the first half of the 20th century could be expected to know about these extra components...

The full map is stored at Wiki in high-resolution.

Update: As "Nik" has pointed out in the comments section, the link I cited for this blog entry was dated 2003. I don't know how I wandered that far back. The arguments in the 2003 paper were subsequently rebutted.

Darn it. I wanted it to be authentic. Like the Kensington Runestone...