Autotype

Autotype (Gk. autos, self; typos, lit. stamp), a permanent print produced from a photographic negative as follows: - The paper on which it is printed is coated with a film of bichromatised gelatine, in which lampblack is held in solution. The negative being placed over it the light hardens those parts of the film to which it is admitted; the other parts are afterwards washed away, leaving a permanent print. The process is better suited for the reproduction of oil paintings than of engravings or of etchings.