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wiki:darkroom:chemistry:formulas:cyanotype

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Cyanotype

To prepare and print cyanotypes.

Preparations

Prepare stock solutions as described below.
(Should be enough to coat approx 10 sheets 8×10“)

Part A

Ferriammoniumcitrate (green), 6 gr
Water (deionized) 25 ml

(store in the dark)

Part B

Potassium Ferricyanide, 2.5 gr
Water (deionized) 25 ml

(store in the dark)

Instructions for use

Here is a general description on how to proceed

  1. Prepare solutions as above (store in dark).
  2. Mix equal proportions of part A + B. This work solution in sensitive to light.

(Approx 10 drops of A with 10 drops of B is enough to coat 12x12cm)

  1. Coat paper and let dry (in dark).
  2. Make a contact print in UV-ligth, approx 20 min in strong sun (outdoors).
  3. Develop by a rinse in water.
  4. A weak solution of citric acid may help to wash out all iron from the exposed print. Approx 3 tsk citric acid to 1000ml water. Treat for a couple of minutes.
  5. Make a final wash in running water for approx 10 minutes.

Notes

This is the place to write down notes, tips etc.

wiki/darkroom/chemistry/formulas/cyanotype.1642885924.txt.gz · Last modified: 2022/01/22 22:12 by henpe

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