Revision as of 14:26, 29 April 2016 by Jruggiero (talk | contribs) (Text replace - "== Authority ==" to "== Sources Checked for Data in Record ==")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search


An early photographic process for negative/positive images. The calotype process was patented by William Henry Fox Talbot in 1841 in England. It used a silver chloride emulsion coating on paper that was exposed to form a latent negative image that was developed with gallic acid then fixed with sodium hyposulfite. With contact printing, multiple positive images could be produced from each negative print.

Synonyms and Related Terms



Other Properties

Often the back of the negative was waxed prior to contact printing

Sources Checked for Data in Record

  • Encyclopedia Britannica, Comment: "calotype" [Accessed March 18, 2002]. ...invented by William Henry Fox Talbot of Great Britain in the 1830s. ......Talbot patented his process in 1841.
  • Website address 1 Comment: Preservation 101 -glossary of terms at