Re: The Vinland Map's Ink

On 15 Apr 2005 13:19:00 -0700, "Ken Towe" <ken.towe@xxxxxxxxxxxxxxx>
wrote:

>David wrote:
>
>"I took that to mean that McCrone's evidence was suspect :-) "
>
>David is right! That's the correct interpretation. There was a feeling
>that McCrone may have made some mistakes (which he did) and that was
>part of the reason that Cahill et al. were retained by Yale to
>reevaluate the Map using a different approach.

It wasn't that it was thought that he had made a mistake but that
there were practical limits to what he could achieve with optical
microscopy.

>They could have shown
>that McCrone was wrong but, in fact, they provided him support even,
>though they got the quantitative aspects of their analysis wrong. They
>found Ti as the most common element in the ink (of the elements above
>sodium) and also that it was consistently present in higher amounts in
>the ink than on the parchment. In fact, only 5 of 33 ink-parchment
>pairs had Ti on the parchment above the minimum detectable limit. If
>there is any anatase on the parchment it is trivial compared with that
>in the ink. Brown & Clark subsequently reconfirmed this observation. It
>is difficult to see how this anatase with a modern appearance (free of
>clay minerals) and present in the yellow organic binder UNDERLYING the
>black carbon component, could have been added later, even if such a
>bizarre and atypical combination had been a medieval concoction.
>




Eric Stevens

.

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