The VT100 manual is here:

  http://www.vt100.net/docs/vt100-tm/ek-vt100-tm-002.pdf

And according to

  http://terminals.classiccmp.org/wiki/index.php/DEC_VT100

the phosphor color of the VT100 is “P4” which according to childhood
memories is the
standard phosphor for black and white TV sets.

IIRC, P4 is slightly blueish.

And if I may comment, the communities of people interested in old terminals
seem to be fully
as obsessive as the group here!

There were lots of different standard phosphors, differing in color and
“persistance”.  You would use a
fast phosphor like P4 for a TV constantly refreshing and a slow phosphor
like P40 for things like
oscilloscopes and radar sets on which you want the picture to fade slowly.

The VT100 manual says there were both Elston and Ball monitors used in the
VT100.  It doesn’t say if
they were exactly the same color.

-Larry
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