Ptilota sericea
date: 1843
taken by: Anna Atkins
source: The Public Domain Review
This is a cyanotype, a photography technique invented in 1842 wherein you place an object on a paper coated with iron salts and then expose it to sunlight. This creates a white image on a blue background.
This cyanotype shows the plant "soft feather weed", the scientific name of which has today been changed to Plumaria plumosa. It was made by the English botanist Anna Atkins (1799-1871) and published in "Photographs of British Algae: Cyanotype Impressions" (1843), often regarded as the first book to ever be illustrated with photographs.
(Anna Atkins photographed in 1861)



















