Photographic fixer formula
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. . . If a photo laboratory does not have an appropriate container for collection of this material, the Office of Environmental Health and Safety (OEHS) can provide 4 … . . . 750 mlBenzotriazole . For bromoil, use dilutions of 1:6 to 1:12.Water (125 degrees F) . . . .
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. 1 litreUse undiluted for high contrast. .
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Developing times range from 5 to 7 minutes.Sodium Sulfite (anhydrous) . . . . If crystals form during storage, redissolve by warming the bottle. . 1 litreFor use, place negative in solution A for 1 to 5 minutes, then place in solution B for 5 minutes. . . . . . . . .
. . . . . . Pyrocat-HD is not subject to problems with uneven development, so agitation can be reduced to once per minute or less.
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. The print is washed in water, swelling the gelatine into a relief matrix that will accept greasy ink in the shadow and mid-tone areas, but repel it in the highlights (where the water content is highest). . . . . . .
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For a slower reducing action, increase the amount of water or reduce the amount of Solution A.Water to make . Develop 9 to 15 minutes at 75 º F. Keeps almost indefinitely.Distilled Water (125 degrees F) .
. 750 mlMetol . . F.) . 28 gCatechol (pyrocatechin) . Atlantis Silversafe 200g/sq m., Somerset Satin and Waterford Satin are good papers to start with, however it is advisable to make tests to find a paper to suit your requirements.in subdued tungsten light, and dry away from light and heat. . Wash in running water until all milky silver nitrate residue disappears.William Henry Fox Talbot's original salted silver nitrate paper evolved between 1834 and 1839. . . Powdered pigment should be ground with a small quantity of liquid gum arabic. . . . .
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The Ansco 120 formula above is often referred to in formularies as Agfa 120.Water (125 degrees F) .
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100 mlPotassium Carbonate . . . .
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Cool the solution before proceeding.Prepare the following solution and add it (including precipitate) slowly to the hypo-persulfate solution while stirring the latter rapidly.
Potassium Dichromate (bichromate) Ammonium Dichromate (bichromate) is capable of a more saturated solution, decreasing exposure time, but giving some problems of exposure control.Potassium dichromate: make a 10% saturated solution (10g to 100ml distilled water) The solution will keep in the dark.
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Dilute for use: 1 part stock to 3 parts water. .
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. . . . . . . . . 2.33 gKodalk (Sodium metaborate) . . . . . . . .
A mangle press or the back of a spoon can be used for the transfer, which is suitable for colour work as a series of selective matrices can be printed in register to produce a coloured image. . 750 mlMetol .
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. In the darkroom, cut the test roll into two, three, or four equal strips. .
. . . . 1 ltrAn economical, slow-working low-contrast developer for use when a low density range is desired.Distilled Water (125 degrees F) . . . 11 gCold Water to make . . . . Produces neutral tones on bromide papers.Water (125 degrees F) .
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