Photographic History: The Calotype
(5 pp.) The base of a calotype negative, rather
than the glass or film to which we have become
accustomed, was high quality writing paper. The
sheet of paper was carefully selected to have a
smooth and uniform texture and, wherever possible,
to avoid the watermark. It was offered as the
chief alternative to the Daguerreotype and was
more popular with amateur photographers, artists,
and scientists, who used it, largely because the
negative could be corrected with pencil.
Bibliography lists 5 sources.