The Dictionary of Photography for Amateur And Professional Photographers
The book The Dictionary of Photography for Amateur And Professional Photographers was written by author E J Edward John Wall Here you can read free online of The Dictionary of Photography for Amateur And Professional Photographers book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Dictionary of Photography for Amateur And Professional Photographers a good or bad book?
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Water ... ... ... 100 ,, which should be spread over the proof with a broad brush, care being taken that no solution touches the back of the paper or stains will be produced. As soon as the image appears of a deep blue colour, the print should be well washed, and then laid in dilute hydrochloric acid i : 10 till the ground appears white ; and the print should then be well washed and dried. Waterhouse has suggested another process. I. Gum Arabic ... ... ... 170 parts. Water ... ./ 650 „ II. Tart...aric Acid ... ... ... ... 40 parts. Water 150 ,, III. Sol. ferric chloride 45 ° Baum6 ... ... 150-120 parts. Mix solutions l and 2, and add gradually, with constant stirring, No. 3 ; allow the mixture to stand for twenty-four hours, and then dilute with water till the specific gravity is itoo. The solution, and the paper sensitised with it, will keep for some considerable time. The exposure in direct sunlight is from 15 to 40 seconds, in diffused light from 10 to 30 minutes. As the image formed by light is only very faintly visible, it is advisable to use a strip of paper, either exposed under one corner of the plan or drawing, or under a similar and smaller one at the 170 Cyclograph Cylindrograph same time; and when test slips from this develop a blue image on a yellow ground the exposure is sufScient.
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