[Milsurplus] [die at dieconsulting.com: Re: WWII Facsmile]

[Jim Haynes]

The paper that was marked by burning off the coating was Teledeltos,
invented at Western Union and made for them by their suppliers.  At one
time the process was secret, so they had several different suppliers
doing different parts of the production.

There are several articles about Teledeltos in the Western Union Technical
Review, which is online at massis.lcs.mit.edu   google for it.

Wet chemical papers were made by Alden and Hogan.  Alden's was sepia
colored, and Hogan's was called catechol and was gray colored.  The two
companies argued a lot about which was better, but to the end user
both of them were fairly lousy.