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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t streaks and things. Rockthe tray continuously for the required time, then rinse platethoroughly, front and back, and place in reversing solution.Rock a few seconds, then turn off your battery switch (ifyou do not your batteries will be run out), an turn on yourwhite light. If you use electric light or Welsbach, such as Ihave, take your tray of reversing solution with the plate in it,and hold it a couple of feet from the source of light and keepit there until reversal is complete. One cause of failure in color plates is due to the fact thatthe plates are not subjected to sufficient white light beforethe second development, or that the second development. isnot prolonged sufficiently. There is a point about this that requires a little study. Inthe first exposure you obtain a negative in which the truecolors are masked, since they are the only ones that make animpression on the sensitive emulsion, and consequently arethe only parts affected by the first developer; but by the action 232
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BISHOP WRIGHT. Jane Reece. of the reversing solution, which is only a reducing agent, youdissolve away all of the metallic silver (blackened portions),so that these portions become transparent and the true colorsappear. The balance of the plate which appears white must now bemasked or blackened so as to concentrate the transmitted lighton the true colors, thus making them more brilliant. This white portion not having been previously acted uponby the light, was not affected by the first developer, so toblacken it, it is necessary to expose it to white light and thendevelop it with the second developer. If you expose thiswhite portion to too strong a light you are apt to solarize it,so it is difficult to obtain a good deposit in second developer,in which case intensification will have to be resorted to. Thesame applies if the plate has not been exposed long enough.Prolong the second development in preference to shorteningit, particularly if intensification is necessary with the follow-i

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