By G.G. Lorentz, etc.
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Additional info for Birkhoff interpolation
The evidence must be conclusive or the ethical dealer will not offer it for sale. The dealer in historical letters and documents has a great advantage over his colleagues in the questioned document field the dealer does not have to reach a conclusion. Unlike the expert hired to reach a conclusion one way or the other, the dealer can simply decline to handle a piece he is not absolutely certain of. In the case of the Hitler diaries, no competent dealer in historical documents would have accepted examples for comparison from the person who brought them the questioned writing itself.
In less than half an hour I had concluded that most likely all were forgeries. That could have been described as intuition, but that intuition was based on the instinctive observation that the paper felt a little different from how it should, the pen lines were a little shaky, ink colors were a little off, styles of handwriting just did not fit with thousands of letters I had seen from the same period and geographical area over the past thirty years. In only another ten minutes, however, I had found one scientific error that the Mormon forger had made a common denominator that could be demonstrated in court, not a subjective opinion but a factor that would graphically and conclusively demonstrate to a jury that these were forgeries.
A procedure has also been developed for establishing the amount of time an ink has been on the paper based on the migration of ions into the paper. As paper ages, it becomes more absorbent, and ink applied to old paper will in most situations be rapidly absorbed into the paper, spreading out in a feathery pattern and creating an outline to the main strokes. The William Henry Harrison signature was forged on a genuine document of the early nineteenth century . The unusual flow of the ink is apparent in this enlargement .