Methods:Cyano      

 

~ Home ~ Copper ~ Van Dyke ~ Hypo Iron ~ Vitamin C ~ Seawater Plates ~

Cyanotype Variations

Cyanotype imageNOTE: NO CYANIDE COMPOUNDS SHOULD EVER BE MIXED WITH AN ACID


Traditional Mix:

Solution A:

25% ferric ammonium citrate (green scales)

Solution B:

10% potassium ferricyanide

mix equal parts A and B just before use, coat paper, dry, expose and develop by washing in water.

Source: Historic Photographic Processes - A guide to Creating Handmade Photographic Images, Richard Faber, 1998

Variation 1:

Solution A:

20% ferric ammonium citrate (green scales)

Solution B:

14% potassium ferricyanide

mix equal parts A and B just before use, coat paper, dry, expose and develop by washing in water.

>>> This is the formula that I use for my own work. 5-10 minute exposure to full sun depending on the density of the negative. For paper I like to use Epson Double Matt Inkjet paper. VERY smooth finish and high resolution, resonable cost and faster washing than thicker art papers.

Source: Alternative Photographic Processes, Kent Wade, 1978

Variation 2:

Solution A:

22% ferric ammonium citrate (green scales)

Solution B:

16% potassium ferricyanide

mix equal parts A and B just before use, coat paper, dry, expose and develop by washing in water.

Source: Breaking the Rules, A Photo Media Cookbook, Bea Nettles, 1977

NOTE: Too little Potassium ferricyanide will result in color bleeding into the whites. Too much will cause the exposure to be longer. [in above formulas, the Traditional has the lowest ratio and Variation #2 the highest]


Single solution. Mix up just before use: [same as variation #1 above]

in 20ml of water add

2 grams of ferric ammonium citrate (green scales) and dissolve. Then add 1.4 grams potassium ferricyanide and dissolve.

Expose in a contact printing frame to full strength sunlight for 2-5 minutes. wash in water and dry.

You can intensify with 3% hydrogen peroxide or half strength household bleach.


Yet another:

Solution A:

25% ferric ammonium citrate 1% oxalic acid (or citric acid)

Solution B:

9% potassium ferricyanide 0.1% potassium dichromate (carcinogenic)

mix equal parts A and B just before use, coat paper, dry, expose and develop by washing in water.

Gives more intense blues.
 

Chris Patton, cpatton@stanford.edu