This was a project I worked on called Kallitype, which is an Iron-silver process. To make a kallitype a suitable paper it is first coated with a solution of ferric oxalate and silver nitrate, using a brush. When dry, the sensitized paper is exposed to a negative under an ultraviolet light source. Since kallitype is a contact-printing process, a printing frame or vacuum frame, or even simply two sheets of heavy plate glass need to be used. After exposure, the paper is developed, cleared, toned, fixed, washed and dried.