On 6/12/24 22:32, Gavin Scott via cctalk wrote:
Is it possible they were thinking about really old FAX
paper which
might have been wet to support marking via an electric discharge
through it (and to (slightly) reduce the frequency with which the
receiving machine caught fire)?
Yes, there was teledeltos paper, that had a silver top layer
and a carbon layer below that.
A high voltage spark burned away the silver layer and left a
black image.
Jon