"1856" is much too early! This was the time of the first experiments in making cellulose/nitrate or nitro-cellulose artificial plastics. Dependable (but still dangerous) formulae were patented in 1869 (some sources say "1868")—and it was AFTER this time that commercial products would have been manufactured. However, due to the physical breakdown of these plastics (occurring because of ambient heat and exposure to ultraviolet), very few of these really early plastics remain. Some of mine self-destructed inside a protective box in storage.

https://www.britannica.com/technology/celluloid