Practical Magazine 22, 1876
(Chemistry applied to the Arts, Manufactures, &c.)
When black oxydized or such of dead silver articles had to be varnished, it has hitherto not been found possible to do this in an entirely satisfactory manner. A varnish which has proved itself effective consists, according to the "Photographische Archiv," of 18 parts of alcohol, 3 parts of red arsenic, and one part of castor-oil; for especially fine articles it may be diluted with the same amount of alcohol.
— Der Metallarbeiter.
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