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James Enterline wrote:
Why should someone resolutely intent on authenticating a forgery put
anatase anywhere?
Possibly because, having intended to create the ink for the forged map
by recycling paper and parchment from the "Speculum Historiale" as soot
and gelatin, he (or she) found that a further ingredient was needed to
achieve the desired visual appearance, and knew it had to be a pure
inorganic chemical if the carbon-dating trick was to work (but did not
know how remarkable the process for producing pigment anatase actually
was).
However, the catch with that scenario is: where does the mystery
chemical permeating the parchment fit in?
David Bradbury
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