File:The American annual of photography (1912) (14785602273).jpg

Identifier: americanannualof1912newy (find matches)
Title: The American annual of photography
Year: 1912 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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to wash away. The glasses may be bought ready for use or be prepared as follows: Soak Yz oz. of Nelsons No. i gelatine in 20 ozs. of coldwater for a quarter of an hour, warm till melted, and add10 grains of bichromate of potash; filter this solution throughfine muslin, flow over the glass plates, which must have 42
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PORTRAIT STUDY. J. F. WILDE. previously been carefully cleaned, allow to drain and dry ina rack. Expose to light for a couple of days that the coatingmay become thoroughly insoluble. Take care to avoid dust at all stages and any particles ofdirt in the mounting water. When mounting the tissue onthe glass it is advisable to cover the back of the tissue witha piece of wetted temporary support placed glazed sideuppermost and squeegee upon that, as if this precaution beomitted crape like markings may be produced in the trans-parency by the pressure of the squeegee direct on the backof the tissue. Development should be begun in water comfortable to thehand and increased afterwards to a temperature as high asthe hand will bear, and should take about five minutes tocomplete, or more, when printing has been deep to securefull contrast. Hotter water from a tap or kettle may bepoured on the transparency for the same purpose withoutinjury. When development is complete, rinse in clean cold watera

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