Beeswax
From George Eastman House : Notes On Photographs
The natural wax produced by bees to store honey in the hive. Beeswax was heated and combined with solvents and oils to produce a paste for coating prints. Such coatings improved the tones of salted paper prints and other processes without the necessity of binders. The coatings also provided an atmospheric barrier.[1]
- ↑ Osterman, Mark. 2007. Beeswax. In The Focal Encyclopedia of Photography: Digital Imaging, Theory and Applications, History, and Science, ed. Michael R. Peres, 46, Focal Press.