A buddy of mine and I tried to make knock off real photo post cards about 30 years back, so since we never sold any I guess I can't go to jail.
We used a process camera with Eastman PRO copy film to make 1:1 copy negs of a premo original card . We would contact print on double weight Azo 11 X14 made 8 cards. Azo stock didn't have any uv brighteners. After normal development we cooked up a brew of our own version of Halo chrome (Tollens reagent for aldehydes). Used dilute in combination with regular dektol we were able to get very subtle silver in in the shadows. Used an antique letter press to backprint either an Azo or Kruxo back. Then a very little dilued tea, maybe a smudge of cigarette ash on the back and rough up the edges a bit. Pretty impressive I found a few the other day. Looked good.
One trick is find some Single weight F surface fiber base paper and ferrotype it. That puts it pre rc paper.
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