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countable and uncountable, plural collodions
A syrupy solution of nitrocellulose (pyroxylin) in alcohol and ether that evaporates on a surface to form a clear elastic film; used in surgical dressings, photographic plates and lacquer paints. quotations examples
The mysterious odour of collodion permeates these memories.
1993, Rikki Ducornet, The Jade Cabinet, Dalkey Archive Press, page 14