SALT PRINT
The negative is placed in contact with a sheet of writing paper which has been floated on salt water and then coated with silver nitrate. After exposure to sunlight, the finished print is fixed in "hypo', washed and dried. Unless they have been glazed or varnished, salt prints have a matte surface, with the image actually embedded in the fibers of the paper. Their tones can range from reddish brown to chestnut brown.
SCULLY & OSTERMAN

CARLO CHECHI
http://www.collodion.org/q&a_salt.html
http://www.photographymuseum.com/primer.html
http://www.alternativephotography.com/gallery3/Carlo-Chechi/Salt-prints/Untitled