As with many requests posted here in the recent past, there is a need for
much more information to adequately address the question.

Size, form and format of source materials?
Colors of ink?
Age of materials?
Data on both sides that might bleed through in imaging?

There is some truth to the fact that thermal materials can tend to further
expose when subjected to the intense light associated with some scanners,
making the content no longer legible.  Similarly, the contrast drops when
capturing the images, so the resultant images may be difficult to read.

Some thermal output from medical devices are in the form of strip charts,
such as those produced from an older EEG or EKG machine. These could be a
few inches wide by many feet long, so they would have to be cut and stitched
to generate a 'scanable' source document.  Many of these have a red or
orange background grid the data is written on, or they write data in
multiple colors, so scanning is difficult.

Lots of old NCR paper or thermal images have simply lost the integrity of
their content over time, from being rubbed against, exposed to light,
moisture, dust or other environmental issues.

Larry
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