File:The American annual of photography (1912) (14742923406).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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before, with the result that we have adirty greenish print. We next change the portions of sulphiteand of carbonate and soon are so far off the track that it wouldseen that there was no such thing as getting right again. The same thing will happen time and time again, even withour good negatives. We have changed carbonate, sulphiteand bromide, but have not improved matters any by thesechanges. Now, we will admit that the makers of the paper are in aposition to know the developing formula best suited to theirmake of papers, so it will be best to take their directions asa base to work from. As no two grades of paper work ex-actly alike it is impossible to prescribe a set formula; butthere is a way in which we can proceed with all of them, nomatter whether our negatives are too flat and thin or too con-trasty. The first thing to do is to see that you are working in,aroom that is of proper temperature—about 70 to 75 degrees.At this temperature our solutions are in their best working 236
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o pq 3 OH P!i condition, and the air does not chill the prints while theyare being transferred from one bath to another. 80 degreeswill be found a little too warm and incline to fog. Next,be sure that your solutions are mixed exactly according tothe formula that comes with the paper. Now you are on theright track and must avoid getting off by using a little bromide,then a little water, then a little more or less of carbonate,but change only one thing at a time, leaving the bromidealone until you get an idea of the effect of the one change,and then using bromide as though it was the most expensivechemical you have. Every experiment should be started rightfrom the one base, the prescribed formula and your experimentstried one at a time, using barely enough bromide to keep thewhites clear. You should remember that a print exposed to alight twice as strong as the one in use will not give the sameresults in half of the time. It seems that it requires a certainpercentage of time for the lig

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