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. 1901 Excerpt: ...glycerine form a stripping solution which acts slower than the preceding but is quite reliable. The formula and directions here given are quoted from an article by E. C. Middleton in The Photogram. Prepare: --This may be safely applied to any negative, no matter how developed or treated. Where the negative has been ...
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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. 1901 Excerpt: ...glycerine form a stripping solution which acts slower than the preceding but is quite reliable. The formula and directions here given are quoted from an article by E. C. Middleton in The Photogram. Prepare: --This may be safely applied to any negative, no matter how developed or treated. Where the negative has been hardened by means of alum or other matter, the solution will be much longer in penetrating to the glass and releasing the film, and where such hardening is known to have taken place the quantity of acid may be doubled. The negative should be immersed in the solution, and a corner tried from time to time by means of a pointed stick. When it is seen that the film is quite loose upon the glass, which really arises from the acid finding its way through the film and etching away the surface of the plate, remove the negative glass, still bearing the gelatine, to a levelled plate--pour a small quantity of solution upon the film to facilitate the removal of air-bells in squeegeeing. Have at hand a piece of photo-litho transfer paper (obtainable from Penrose & Co., ) soak it in the solution a minute or two until uniformly wet, lower it, gelatine side downwards, upon the loose negative film, and squeegee them into contact. Allow to stand three minutes, remove the paper, which will now carry away the negative film, and allow to dry spontaneously. The film will remain in contact with the paper and will consequently be slow to print, but will possess no other disadvantage. Should this slowing be an insuperable difficulty, substitute for it a celluloid film, coated with a plain gelatine solution instead of an ordinary sensitive emulsion. Should any difficulty be found in obtaining the same, fix out an ordinary thin celluloid film in hypo and use in precisely.
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