Rhodomenia ciliata [= Rhodymenia ciliata] c. 1843 - 1853

This is a cyanotype made by Anna Atkins, part of her work documenting British algae. Cyanotypes like this one are made with paper treated with iron salts. When exposed to sunlight with an object placed on top, the paper turns a distinctive Prussian blue, except where the object blocks the light. The process allowed Atkins to record the delicate forms of algae with great precision. It’s a relatively simple process, but it produces images of striking clarity. Consider the social context, though. Photography was still quite new at this time, and here we see it being used not just for art, but for scientific documentation. The very choice of a cyanotype – a technique that could be mastered without extensive training – speaks to a desire to disseminate knowledge widely. It’s a reminder that the most impactful art often comes from the intersection of creativity, scientific curiosity, and a commitment to accessibility.