heliotype
/ˈhiːliəˌtaɪp/
noun
- A photographic print made by a process using gelatin and a metal plate, popular in the 19th century.
- The museum displayed a rare heliotype of a Victorian street scene.
- Collectors value heliotypes for their soft, detailed tones.
- She found an old heliotype in her grandmother's album, faded but still beautiful.