[GreenKeys] Paper (was Ribbons)

[Jim Haynes]

Now the Extel machines sometimes used ribbons and sometimes printed on
special paper made by 3M that turned black when struck.  I assume that
was a lot more expensive than plain paper, so I don't know why anyone
would choose that kind of paper unless the printing volume was small.

It was described to me that it was like microscopic white eggs containing
black ink that were on the surface of the paper, so that impact broke the
eggs and released the black ink.  So far as I have been able to learn
the special paper is no longer available, so an Extel printer without
the ribbon feature is practically useless today.

jhhaynes at earthlink dot net