Manufacturer and Builder ?, 1893
The Revué de Chimie Industrielle says that the prints should be first passed through water acidulated with nitric acid, and thence into -
Carbonate of soda ... 50 grammes.
Water ... 1 liter.
In this the picture is changed to an orange tone, when it is removed and placed in -
Gallic acid ... 50 grammes.
Water ... 1 liter.
Being subsequently washed in water acidulated with HCl.
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