This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...themselves on the print and hold the hypo under them, allowing it to go on bleaching, thereby getting little white spots on the prints when they came from the wash water, that were not there when they were fixed. After two waters by hand, one hour in running water, or ten to twelve changes by hand, is sufficient ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...themselves on the print and hold the hypo under them, allowing it to go on bleaching, thereby getting little white spots on the prints when they came from the wash water, that were not there when they were fixed. After two waters by hand, one hour in running water, or ten to twelve changes by hand, is sufficient washing. Red spots on paper can come from a number of causes. The most common forms are finger marks, bubbles and preservative chemicals still in the paper. When from finger marks, they can be easily recognized. When the spots are round or oblong and have defined edges, they are from bubbles and can be avoided by sliding prints in the first water and knocking them off. If the red spots are uneven and scattered over the paper, or if the prints act as though they were greasy when they are in the washing water, the trouble comes from oil or grease, which may come from the hands, trays, or water. This trouble can be overcome in both Platino and Junior paper by adding three ounces saturated solution of sal soda to the first water prints are placed in (3 oz. saturated solution of sal soda to each gallon of water), handling prints over in this water for five minutes. This alkali cuts off all oil or grease on the prints and neutralizes the acid preservative chemicals in the paper, the six changes of clear water afterwards washing out all traces of the alkali and bringing your prints up to the gold bath in a perfectly neutral condition. If you find 3 oz. saturated solution of sal soda is not enough, put in a couple more or enough to do the work. When paper prints brown or muddy-looking in the winter, the paper is too fresh and should be put in a warm place (near a radiator) for a few days. Paper treated in this way will soon print a rich red color. Fresh pap...
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