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Typo: A Monthly Newspaper and Literary Review, Volume 5

[Fluorography]

Fluorography.—Under this title, the Revue de Chimie Industrielle et Agricole describes a process of transferring lithographic or phototypic prints to glass by means of fluorated inks, which, in contact with sulphuric acid disengage hydrofluoric acid, which eats into the glass. The phototype is inked with the following compound, in the given proportions (by weight): Soap, 50; glycerine, 200; tallow, 50; water, 100; borax, 25; fluorspar, 50; lampblack, 15. Negatives are taken and transferred to the glass. The latter is surrounded with a border of wax and covered with sulphuric acid of a density of 64° or 65° Baumé. After fifteen or twenty minutes the acid is poured off, and the glass is washed with water and cleaned with a solution of potassa, then washed with water again and dried with a cloth.