File:The American annual of photography (1912) (14579303118).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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of anysort—that is in reasonable quantity—to prevent fog. Thereis only one safe light that is a real safe light made in thiscountry. It is a screen which passes deep red rays to whichno plate, save a panchromatic, or a color plate is sensitive.It, however, is not cheap, the light is rather dim for ordinaryplates, i. e., green-yellow sensitive plates, and does not passthe maximum light usable with ortho-plates. The problem has gone beyond the red glass and orangeglass of former years, and the modern dry plate will notstand any such treatment, unless a very weak illuminant isused. Tank development has done away with a great dealof the work in the dark room, but lantern plates, bromidepaper, and factorial development need light to do successfully,and I must confess that I favor factorial development ratherthan tank. There seems to be no way to work very slowplates with a very strong developer in order to arrive at resultsof extreme contrast, by using the tank, and a great deal of 244
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CHILD PORTRAIT. KATHARINE BINGHAM. my work must perforce be done under these conditions. Forthe amateur the tray system offers more pleasure than anyof the No dark room plans that have ever been proposed,and I confess that I have never gotten over the fascinationthat there is in seeing a good clean image appear on thesurface of the plate. Ruby light to most men means a dark red light. Orangemeans anything from a deep yellow to a red-brown. Theaverage ruby glass sold for photographic purposes is not 245 suitable and unless used with a very weak illuminant for avery short time, will surely give a fog strip if it is tested.Ruby and orange as usually sold are unsafe, for the simplereason that they are not tested. There is only one way tofind the value of a light for this purpose, and that is to makea spectroscopic examination of it, and find exactly what raysit passes, and what it absorbs. The ruby glass as usually soldif combined with orange will sometimes prove safe—often thecontrary.

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