Glossary

Albumen Print
Photographic prints made on thin paper coated 
with albumen (egg white) containing silver halides. 
In use from 1850 to 1890.

Aquatint
A print reproduced from an acid etched copper plate,
resembling a watercolour in its tonal effects.

Daguerreotype
Photographic process invented by Louis Daguerre and 
introduced in 1839. The unique image was produced on 
a small silvered metal plate.

Engraving
A print produced from an incised woodblock 
('wood engraving') or metal plate ('steel or 
copper engraving').

Lithograph
A print produced from a flat wetted limestone on which
the design is drawn in grease and then coated with oily 
ink which clings only to the greasy design.

Stereograph
Three-dimensional image produced by taking two photographs
from viewpoints about 65 mm apart, viewed through a 
stereoscope, a device which allows each eye to see one
picture.
In use from 1858 to 1935.