Re: The Vinland Map's Ink

Eric Stevens wrote in message
<6qr3619qsdlcdolikidtgu9dmpfvvhb7k7@xxxxxxx>...
>
>On 16 Apr 2005 18:30:12 -0700, "Ken Towe" <ken.towe@xxxxxxxxxxxxxxx>
>wrote:
>
>>your hypothesis (to be tested) must explain why this modern anatase did
>>not also appear on the parchment. Please, don't fall back again on that
>>hackneyed excuse that we don't know everything possible about the ink
>>and therefore we cannot think about it. That's a really weak position.
>>
> You have the advantage of me in that you will have read virtually all
>of the relevant literature as it was originally published. For the
>most part I have had to do with with paraphrases, popularisations,
>summaries, selected quotes etc. However, nowhere have I read that
>anatase was found under the carbon upper layer. As I understand it,
>the anatase has been found in the yellow layer in places where the
>upper layer has been lost.

I think I dealt with this one a few weeks ago:
McCrone's analyses of small samples, by various methods, found anatase
(or Ti for elemental analyses) in the yellow but not the black.
Cahill's analysis, by PIXE, of vertical sections through the whole
document (both layers of the ink + the parchment) found high levels of Ti
in some of the blackest parts of the line (notably the coast of Vinland
itself)- the important bit that's missing from the public version of the
information is that the Cahill team visually assessed a "blackness" value
for each test location
Brown & Clark's analysis, by Raman spectroscopy, of the surface of the
ink and parchment in situ, found depressed anatase spectra in the blackest
parts of the line (they too included the Vinland coast)

So PIXE, which penetrates through the black layer, is finding enhanced Ti
levels underneath, whereas Raman, which is non-penetrative, finds decreased
anatase levels consistent with masking of the yellow layer by the black.


David B.


.

Relevant Pages

  • Re: The Vinland Maps Ink
    ... >>>not also appear on the parchment. ... >>anatase was found under the carbon upper layer. ... >(or Ti for elemental analyses) in the yellow but not the black. ...
    (sci.archaeology)
  • Re: The Vinland Maps Ink
    ... >>anatase was found under the carbon upper layer. ... > (or Ti for elemental analyses) in the yellow but not the black. ... > levels underneath, whereas Raman, which is non-penetrative, finds decreased ...
    (sci.archaeology)
  • Re: The Vinland Maps Ink
    ... >>understanding, or has carbon been peeled away to expose anatase in the ... my omission was not accidental. ... >layer where the upper layer has been lost. ...
    (sci.archaeology)
  • Re: The Vinland Maps Ink
    ... Eric Stevens wrote in message ... ... >>>upper layer has been lost. ... or has carbon been peeled away to expose anatase in the ... It seems most likely that the reason for the slightly higher concentration ...
    (sci.archaeology)
  • Re: The Vinland Maps Ink
    ... >>layer where the upper layer has been lost. ... >>peeled away to expose anatase". ... PIXE has been detecting Titanium principally in the upper ... >the Titanium that was found was in the form of anatase. ...
    (sci.archaeology)