Been doing some Cyanotypes, Salted Paper and Kallitypes of late. Fun stuff!
The first is a Cyanotype, split-toned with Green tea, ammonia and yes, weird as it is, gold toner.
The second image is a Salted Paper print toned with gold chloride.
The third image is a Kallitype made from a curved Cyanotype negative, toned with tannic acid followed by green tea after a quick bleach.