Cyanotype is an ancient photographic printing technique (invented in 1842) that utilises the UV component of sunlight to produce images. Exposure of photosensitive iron salts (green ferric ammonium citrate mixed with potassium ferricyanide) to UV rays produces the characteristic, brilliant Prussian blue colour; a wash with hydrogen peroxide deepens the tones.

Bottega Luci uses a homemade UV exposure unit, with 365nm UV LED light, to produce cyanotype photographic prints on rough 100% cotton paper, in various formats.

Here are some examples of cyanotype photographs from Bottega Luci’s portfolio.