• Heliogravure: a rotogravure proof printed from a copper plate. It was used in the printing of pictures in books and in printing postcards. The system of heliogravure was developed by the Bohemian, Karl Klic, in 1877-1879.

 

Source: Kukkonen J., Vuorenmaa T.-J. ja Hinkka J., Valokuvan taide – Suomalainen valokuva 1842 – 1992, Helsinki 1992.