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In a sizing/salting solution for Albumen printing Preservative
HOC (COONa) (CH2COONa)2. 2H2O
Albumen prints use good quality paper - preferably-hand made or mould-made watercolor paper - which is soaked in a salt solution (this can be sodium chlodide, but is often sodium citrate and ammonium chloride, usually around 4% by weight) and dried. In subdued light, it is brushed with a generous coating of silver nitrate solution (around 12% by weight - sometimes containing a little citric acid) and dried in darkness or very subdued light.