[Cyanotype] [Boston] Olmsted Park Trees, 1905
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Large format anonymous cyanotype photograph showing a lush pine bank at Olmsted Park in Boston, Massachusetts on June 22, 1905. Photographer unknown, date and location indicated in light pencil to verso. In very fine condition, with excellent blue tonality and preservation. 7.25 x 9.25 inches (18.4 x 23.5 cm.).
"The cyanotype process uses a mixture of iron compounds, which when exposed to UV light and washed in water oxidize to create Prussian Blue images. The technique was invented in 1841 by Sir John Herschel and was popularized by photographer and botanist Anna Atkins. Her book Photographs of British Algae: Cyanotype Impressions, published in October 1843, is considered the first photographically illustrated book." (Parallax Photographic Coop)