You can turn a film negative into an old-timey cyanotone print with a few chemicals and some printing media. Vinegar or other acidic substances can then be used to intensify the effect.
Cyantotone printing was discovered in 1842. It creates a mildly photosensitive paper that can be exposed to light to create silhouettes and other effects. — Read the rest
Original Link: https://boingboing.net/2020/11/13/how-to-make-vintage-cyanotype-photo-prints.html
