heliotypy


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he·li·o·type

 (hē′lē-ə-tīp′)
n.
1. A photomechanically produced plate for pictures or type made by exposing a gelatin film under a negative, hardening it with chrome alum, and printing directly from it.
2. also he·li·o·typ·y (-tī′pē) The process of producing a heliotype.

he′li·o·type′ v.
he′li·o·typ′ic (-tĭp′ĭk) adj.

heliotypy

the process of making pictures by printing directly from gelatin film that has been exposed under a negative and fixed with chrome alum.
See also: Photography