[GreenKeys] different teletype ribbon colors

[Joe Herdler]

Hi all,
I was wondering if there were ever different colors for the Teletype ribbons. Say using red for classified communications and black for non-classified?
I know that there was an option for dual colored ribbons on the M28 (made of unobtanium) , but I am wondering if say a printer that was used solely for classified comms would simply use a red ribbon.
Thank you again!
Best,
JoeKB0TXC



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