
1) Photographic chemical
Found on
https://www.crosswordclues.com/clue/rodinal

Rodinal is the trade name of a black and white developing agent produced originally by the German company Agfa based on the chemical 4-aminophenol. ==History== Rodinal was patented January 27, 1891 by Dr. Momme Andresen. It was the first product sold by Agfa and is the oldest photographic product still available (2014). After the patent expired, R...
Found on
http://en.wikipedia.org/wiki/Rodinal
No exact match found.