. The book of photography; practical, theoretical and applied. ;but for those who prefer to make theirown the following formula is given:— Nelsons No. I gelatine ... ... 2 ozs. Ammonium bichromate .. ... 3J drs. Water ... ... ... ... 8 ozs. When the bichiomate is dissolved, andthe gelatine well saturated, insert thevessel containing these in a jar of hotwater till the whole becomes of a thinfluid consistency. The mixture is nowfiltered before it has time to become cold,and is applied to a suitable rolled andsized paper while still moderately warm. Sensitising Ready-prepared Paper. If, however,
. The book of photography; practical, theoretical and applied. ;but for those who prefer to make theirown the following formula is given:— Nelsons No. I gelatine ... ... 2 ozs. Ammonium bichromate .. ... 3J drs. Water ... ... ... ... 8 ozs. When the bichiomate is dissolved, andthe gelatine well saturated, insert thevessel containing these in a jar of hotwater till the whole becomes of a thinfluid consistency. The mixture is nowfiltered before it has time to become cold,and is applied to a suitable rolled andsized paper while still moderately warm. Sensitising Ready-prepared Paper. If, however, prepared transfer paper isobtained as recommended, it is merelysensitised in a bichromate solution madeas follows: Dissolve 1 oz. of potassiumbichromate in 20 ozs. water in a bottle,and add just as much ammonia as willsuffice to turn the solution to a lightyellow colour, when examined by lookingthrough. The solution will keep, and ifthe colour changes, a little more ammoniais added. Filtering is advisable beforeuse. For sensitising, the temperature of S^l. Drying Oven for Transfer Paper. the mixture should not be higher or lowerthan about 60° F., so that in winter awater bath of the shape shown by is useful, the outer vessel being filledwith slightly warm water. The transferpaper is placed in the solution, film sideup, and allowed to remain for about oneminute, or until the surface seems soft andthe paper appears saturated. Drying Sensitised Transfer Paper. On being taken out of the bath, thepaper may be drained and hung up byclips in a dark room with sufiicient venti-lation. For fine work, however, it ispreferable to squeegee it to plate glass, 684 THE BOOK OF PHOTOGRAPHY. allowing it to dry on the glass and strip-ping when dry. For ordinary purposes,except in hot weather, the sensitisedpaper will keep good for two or threedays ; but for work with fine detail it isbetter to use it within the same day. Adrying oven of the pattern shown by is very useful for
Size: 1441px × 1734px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
