hobby #76

Cyanotype Printing

Sun-printing images and objects using the iron-based photographic process invented in 1842. Coating paper or fabric with ferric ammonium citrate and potassium ferricyanide, exposing under UV light, washing to reveal Prussian blue images.

The Sun Painted What I Left in the Dark

Cyanotype Printing

Half the formula was already in my darkroom. The other half is FDA-approved for treating radiation poisoning.

code-a-day tied to this hobby

Reducing Tones to Sun and Shadow Ordered Dithering

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