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A comment on X-rays reveal censored portions of Marie Antoinette’s letters to Swedish count.

Re:X-rays reveal censored portions of Marie Antoinette’s let... by gotmedium on Sunday October 03, 2021 @10:23AM (#28737378)
> Hyperspectral imaging in the visible and near-infrared ranges initially seemed promising. Unfortunately, the black redaction ink absorbed almost all light in the visible range, and in the NIR range, the two inks were rendered largely transparent. They were too similar to draw any conclusive results. Pottier and his collaborators got the best results with X-ray fluorescence (XRF) spectroscopy in a microscanning mode

Does anyone know what are the other use cases for these techniques? The article is very interesting! Thanks for sharing

[ Parent | on HN ]
Re:X-rays reveal censored portions of Marie Antoinette’s let... by somebodynew on Sunday October 03, 2021 @11:38AM (#28738004)
Non-imaging X-ray fluorescence is one of the most common techniques for identifying the elemental composition of metal alloys, including both industrial metallurgy and verification of gold and silver coins in precious metals trading. Handheld XRF scanners are readily available but cost several thousand dollars.
[ Parent | on HN ]