[GreenKeys] paper tape variants

[John Nagle]

> yes, there really was "other" than just yellow (or buff)
> colored tape during the heyday of the teletype machine.

      5-channel tape tended to come in yellow, but 6, 6, and 8
channel tape came in other forms.

      Black tape was for photoelectric readers.  Flexowriters
used 6-channel tape, usually pink fanfold.  Burroughs used
7-channel tape, on 8-channel stock.  Both oiled and unoiled
variants were used.

     There was also metalized Mylar tape, a material like Tyvek, used
for long wear in endless loop applications like early numerical
controlled machine tools.  This was hard on punches but lasted longer
in readers.

				John Nagle