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Hershel’s Original Cyanotype Formula
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Solution A
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Ammonio-citrate of iron
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20 parts
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Water
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100 parts
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Solution B
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Potassium ferricyanide
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16 parts
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Water
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100 parts
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Equal quantities of A and B are mixed just before use.
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A “Modern” Cyanotype Formula
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Solution A
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Green ferric ammonium citrate
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110 grains
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Water
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1 ounce
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Solution B
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Potassium ferricyanide
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40 grains
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Water
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1 ounce
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Filter before use.
Use equal volumes of A and B, and develop in running water. If the water is alkaline, a little citric acid should be added to counteract the alkalinity, which should be followed by a final wash in two or three changes of plain water.
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Dick Sullivan’s Recommended Formula
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Solution A
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Green ferric ammonium citrate
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27.2 grams
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Oxalic acid
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0.5 grams
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Water to make
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100 ml.
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Solution B
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Potassium ferricyanide
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9.2 grams
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Oxalic acid
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0.5 grams
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Ammonium dichromate
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0.2 grams
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Water to make
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100 ml.
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Lagrange Formula
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Solution A
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Ferric ammonium oxalate
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10 grams
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Oxalic acid
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1 gram
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Distilled water
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100 ml.
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Solution B
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Potassium ferricyanide
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10 grams
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Water
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100 ml.
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Use equal parts.
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C.B. Talbot Single Solution
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Potassium ferricyanide
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122 grams
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Liquid ammonia .880
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8 ml.
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Ferric ammonium citrate
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197 grams
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Distilled water
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1 liter
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Dissolve the ferricyanide in the water and let stand a few hours. Add the ammonia, then the ferric ammonium citrate, and stir with a glass rod.
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Chambon Single Solution
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Gum arabic
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20 grams
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Ferric ammonium citrate
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30 grams
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Tartaric acid
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20 grams
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Distilled water
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200 ml.
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Dissolve completely and add:
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Liquid ammonia
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40 ml.
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Shake well and add:
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Potassium ferricyanide
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25 grams
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Distilled water
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100 ml.
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Mix thoroughly and allow to stand for a quarter of an hour before use. Print color is improved by a solution of 50 ml. eau-de-javelle in a liter of water. (Eau-de-javell is
also known as sodium hypochlorite, ozone bleach, and Labarraque’s solution.)
To make: add 1 ounce sodium carbonate to 4 ounces of water, shake well; then add 320 grains of bleaching powder [chloride of lime], shake well again and filter out the residue.) This can probably be made into a two-solution formula by separating out the last two ingredients.
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U.S. Liquid to Metric Measure
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Ounces
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Drams
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Milliliters
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1
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8
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29.57
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0.125
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1 (60 minims)
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3.697
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0.03381
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0.2705
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1
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Fisch Ferro-Prussiate
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Solution A
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Tartaric acid
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95 grams
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Water
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375 ml.
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Ferric chloride sol. (sp. gr. 1.45)
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80 ml.
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Liquid ammonia .880, not more than
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175 ml.
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Solution B
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Potassium ferricyanide
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70-80 grams
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Water
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270 ml.
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Dissolve the tartaric acid in the water, add the iron solution, then add ammonia with constant shaking until neutral. Add now the ferricyanide solution with constant shaking, cool,
and store in well-corked bottles in the dark.
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Colas’ Ferro-Gallic Formula
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Gelatine
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10 grams
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Ferric chloride (syrupy)
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20 grams
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Ferric sulphate
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10 grams
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Tartaric acid
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10 grams
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Water
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300 ml.
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Coating should be done with a fine sponge, taking off any surplus sensitizer with a second sponge, only just moist with sensitizer.
Development takes place in a gallic acid solution (one part acid in 320 parts water).
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Lietze’s Ferro-Gallic Formula
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Gum arabic
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6.7 grams
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Ferric chloride (solid)
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5 grams
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Tartaric acid
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3.3 grams
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Monsell’s salt
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3.3 grams
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Water
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100 ml.
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Monsell’s salt is basic ferric sulphate, also known as ferric subsulphate. Development takes place in a gallic acid solution (one part acid in 320 parts water).
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Nakahara’s Ferro-Gallic Formula
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Gum arabic
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15 grams
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Tartaric acid
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2 grams
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Sodium chloride
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9 grams
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Ferric chloride
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15 grams
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Ferric sulphate
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10 grams
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Water
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110 ml.
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Dissolve the gum in hot water and add the rest of the chemicals in the order given. Development takes place in a gallic acid solution (one part acid in 320 parts water).
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Brown Toner for Cyanotype
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Bleach
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Sodium hydroxide
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5 grams
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Water to make
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1 liter
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Toner
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Tannic acid
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20 grams
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Water to make
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1 liter
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Bleach the cyanotype print until it takes on an orange-yellow color, then wash thoroughly. Place print in toner and tone to desired color.
You can also use a mild solution of ammonia or sodium carbonate to bleach the print.
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Uranotype
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Sensitizer
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Green ferric ammonium citrate
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110 grains
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Uranic nitrate
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35 grains
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Water
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1 ounce
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Developer
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Potassium ferricyanide
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22 grains
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Water
|
1 ounce
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Caution: Uranium nitrate is highly poisonous--do not allow to come in contact with skin--wear gloves, goggles, and a long-sleeved shirt.
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Avoirdupois to Metric Weight Conversions
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Ounces
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Grams
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0.03527
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15.43
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1
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16
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7000
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453.6
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1
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437.5
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28.35
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1
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0.0648
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