Identifier: anthonysphotogr1896newy (find matches)
Title: Anthony's photographic bulletin for ..
Year: 1870 (1870s)
Authors:
Subjects: Photography
Publisher: New York : E. & H.T. Anthony & Co.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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to remove the particles of charredpaper which remain attached to the enamel. The design on the roll isnow carefully examined, and retouched, if necessary, when it is readytching. This process is certainly an ingenious one, and suggests numerousapplications. Designs can be photo-engraved by this means on the surfaces oi unwieldy metal bodies, or on curved metal surfaces like- gunelfi or bicycle posts. Of course its principal application will be to.ration of rolls for printing fabrics, wall-papers, etc. A METHOD OF ETCHING VERTICALLY. e di 0V( v thai process men desire most it is a • or method thai will etch a metal plate vertically, and not side- (n <.;< re told oi etchers who possessed such a secret, •tied the treasure to the grave with them. But •!■ 1 Bol who always writes bo interestingly on process :< h a method oi et< King as it it v.eie an ai i omplishi <l method oi et< inn;, is due to an obsei \a G to the effeel thai it a thin deposil oi finely divided
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MY NIECE DOROTHYBY R.EICKEMEYER. JR. 277 platinum be produced upon zinc, the platinum will form the negativeplate of an electric couple, and the zinc under this deposit will beslowly dissolved away even by so dilute an acid as i volume of sul-phuric acid with 7,000 volumes of water, and in such a case the etching-is almost perpendicular to the surface, the tendency to undercuttingbeing practically nothing. Gold may be used as well as platinum ;a solution of the chloride containing about 1 part in 2,000 isflowed over the plate bearing the fatty image, after the whites havebeen cleaned as perfectly as practicable. A dull deposit forms instantlyon the zinc, and, after a rinse with water, the plate may be at onceplaced in the highly diluted sulphuric acid. Here the etching will pro-ceed with extreme slowness and regularity. As the zinc dissolvesaway, the gold or platinum deposit descends and adheres. This method,though extremely slow, gives an almost vertical edge, and may beespecially va

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