Cyanotype photography refers to the process of printing a picture by using sunlight and a series of chemicals. The chemicals involved in cyanotype photography include Prussian blue, aqueous potassium ferricyanide and aqueous ferric ammonium citrate. When producing a cyanotype picture, the paper (or other printing medium) is treated with each of the chemicals.
The image is then placed upon treated paper, weighed down with glass and taken out into the sun. The combination of sunlight and chemicals will then imprint the image onto the paper in a dark blue or gray color. Keep the paper in the sun for five to fifteen minutes, or until the paper is visible bluish-grey.
When the paper has turned, remove the glass and rinse the chemicals off the paper. After the paper is dry, the print is complete.
Objects used in cyanotype photography should be flat and opaque. When using the cyanotype method, remember that the prints turn out best with greater contrast. Also, wear gloves, as the chemicals stain.
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My Lab Prints
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Since it was very cloudy, the exposure time was about 20 minutes.
The color turned into light brown first, and then turned into blueish-gray.
It looked very gray before rinsing in the cold water. I guess part of the reason was because the negative film was not dense enough.
Put the print into the bleach. ( If you soak it too long, it will fade away...)
First shot when I just removed the glass plate from the paper
Rinsing it in cold water.
Then it turned into a beautiful blue color.
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Final Prints!
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Coffee
Tea - Turned into navy blue
Tea + Strong Ammonia (But bleached too long...)
Tea + Strong Ammonia (Couple of seconds)
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