Early Work In Photography
A Text-book For Beginners

84 Early Work in Photograpny. A. Hydroquinone... ... ... 160 grains Citric Acid ... ... ... 60 » Potassium Bromide ... ... 30 » Sodium Sulphite ... ... 960 » Alcohol ... ... ... i ounce Water, to ... ... ... 20 » Dissolve the citric acid, bromide, and sulphite together in about fifteen ounces of water; dissolve the hydroquinone in the alcohol, and then add it gradually to the other solution with frequent shaking; finally, add the rest of the water to make the entire bulk up to twenty fluid ounces. B. Potassium Carbonate ... 1,440 grains Sodium Carbonate ... ... 1,440 » Water, to ... ... ... 20 ounces C. Sodium Hydrate (sticks) ... 160 grains Water, to ... ... ... 20 ounces D. Potassium Bromide ... ... 480 grains Water, to ... ... ... 10 ounces For producing delicate negatives full of detail (having a correctly exposed plate) we must use equal parts of A and B. If we wish to secure much contrast, that is, a negative that will give extremes of light and shade, we must use equal parts of A and C. For general purposes we recommend the use of carbonates as the accelerator, as in B. Let us now suppose that we have an exposed plate ready for development. We must first see that we have ready a clean fixing bath made of Hypo ... ... ... 4 or 5 ounces Water ... ... ... 20 » We must also see that the ruby lantern is in good condition, and that no stray white light is creeping into the develop- ment room. Take a clean white porcelain tray (9 x 7 inches for whole plate, or 5 x 4 for - plate) and place it near enough to the lantern to be comfortably visible. Then remove the exposed plate from the holder, dust it lightly with a broad camel-hair brush, and place it face upwards in the tray. Mix 1% ounces each of A & B, and flow it in an even wave over the plate, and then rock the tray gently in order to keep the solution moving over every part of the plate. Then put