Pyro: What period was it used?

Bob Szabo (rjs@cwreenactors.com)
Fri, 10 Oct 1997 09:32:11 -0400

When was Pyro used for developer. Was it used during the Civil War Period?
What are the differences between that and Ferrous Sulfate in results?

Hope I am not asking a stupid question here. I am just getting into wetplate
and am trying to learn all I can before pouring my first plate.

Best Regards,

Bob Szabo
Co B 8thOVI
rjs@cwreenactors.com
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