These are some examples from my first cyanotype tests. Cyanotypes are a non-silver photographic process invented by Sir John Herschel in 1842. This cyanotype formula uses potassium ferrocyanide as the light-sensitive chemical, and it is fixed in water. One of the earliest users of cyanotypes was Anna Atkins, who was the first to illustrate a book (on British algae) with cyanotypes in 1843. I love the elements of chance and sense of alchemy that comes with this process!