On the absence of evidence that the Vinland map is medieval.
The article, Evidence That the Vinland Map Is Medieval (Anal. Chem. 2003, 75, 6745-6747), is constructed with conjecture and with false logic. It imagines that the ink of the Vinland Map is an iron-gall ink where conclusive evidence shows the ink to be not an iron-gall ink but a carbon-based ink. It asserts that the ink was homogeneous where conclusive evidence shows that it is not. Twenty-nine years ago, the Vinland Map was shown incontrovertibly to be modern. That conclusion stands today.
Henchman
Michael
M