heliotype
See heliotype in American Heritage Dictionary 4
(hēˈlē-ə-tīpˌ)
noun- 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.
- also he·li·o·typ·y (-tīˌpē) The process of producing a heliotype.
Related Forms:
- heˌli·o·typˈic (-tĭpˈĭk) adjective
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