[alt-photo] Re: Coating Silver Chloride Paper - Similar to AZO?

[Alberto Novo]

Etienne, 

> ... hot-pressed paper coated with a fairly thick 
> layer of gelatin heavily loaded with Barium Oxide (turns to Barium 
> Hydroxide when you mix it with water)

Barium oxide or barium sulfate? I always knew it was the latter to be used. 

Alberto
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