Above: experiments with cyanotype on 16 mm film from "Tangled Up In Blue Cyanotype Workshop" at Northwest Film Forum 2020. Exposure of various materials directly on film without a camera.
Lower film clip: Wakame, Agar Rhodophyta, Kombu and Gigartina Red algae exposed with a LED light strip.
Background images: close-ups of developed 16 mm celluloid reels.
Organic Cyan (images of oxygenation)
Sweetwater lake and saltwater coastal regions specifically in the North and Baltic Sea, often affected by seasonal cyanobacterial algal bloom, both caused by and leading to biological (over)-production and sometimes poisonous pollution.
"Blue-green algae, also called cyanobacteria, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Cyanobacteria resemble the eukaryotic algae in many ways, including morphological characteristics and ecological niches, and were at one time treated as algae, hence the common name of blue-green algae. (...)
In addition to being photosynthetic, many species of cyanobacteria can also “fix” atmospheric nitrogen—that is, they can transform the gaseous nitrogen of the air into compounds that can be used by living cells."
Source: Encyclopaedia Britannica