Complete Self-Instructing Library of Practical Photography; Photographic Printing Complete Volume 4

Complete Self-Instructing Library of Practical Photography; Photographic Printing Complete Volume 4

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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. 1908 edition. Excerpt: ... of Potassium.--All developers require the addition of a certain amount of bromide of potassium to keep the whites cleared and it is most conveniently used in the form of a 10% solution, which is made by dissolving one ounce of bromide in ten ounces of water. As the amount of bromide necessary varies with the age, degree of dryness of the paper, the purity of the water and chemicals used, it can only be given approximately. It is easily determined, however, by first adding the amount given in the above formula to the solution and then making a trial test by laying an inch strip of Velox over an important portion of the negative and printing and developing it in the regular way. If the whites appear fogged, add a few more drops of the bromide solution. If on the contrary, the whites are clear and the blacks have a greenish tinge, there is too much bromide in the developer and it will then be necessary to add a little of a stock solution of developer that contains no bromide. To avoid this latter necessity, in adding the amount of bromide do so very slowly and drop by drop, making tests as directed. 703. Effect of Bromide on Tone of Velox Print.--Note that when just enough bromide has been added to keep the whites clear, the blacks may have a bluish tinge. Then, if more bromide is added, little by little, and a test print made after each addition, the tone of the blacks will be seen to change gradually from bluish-black to pure black, and if still more bromide is added, to greenish or brownish blacks. 704. Metol Poisoning.--Metol is of a poisonous nature attacking some people more than others. It often causes an itching and soreness of the skin. With ortol there is little likelihood of danger and practically the same results can be produced as with...show more

Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236663934
  • 9781236663931