How Celluloid Became Moldable
Celluloid was made by combining cellulose nitrate—a chemically treated form of the plant material found in cotton and wood—with camphor, a substance that softened it. The mixture could be shaped into sheets and molded into objects, rather than merely serving as a coating or adhesive. That made it practical to manufacture items such as combs, buttons, and handles in quantity.
The same chemistry that helped make the material workable also gave it a dangerous weakness. Cellulose nitrate contains oxygen as part of its chemical structure, so once it catches fire, it can burn fiercely; it does not need to draw all the oxygen it needs from the surrounding air. Heat or a spark could start a fire, and a burning piece could be difficult to extinguish.
A Useful Material With a Built-In Risk
Celluloid’s flammability mattered wherever it was stored or used near heat and open flames. It also became important as the material for early motion-picture film: a strip of film could carry a fire rapidly through a projector or storage area. Later film materials were developed that were less prone to this hazard.
Celluloid helped make plastic goods reproducible and widely available, but its convenience came with a constraint manufacturers and users could not ignore: the material was easy to shape, yet it demanded care around ignition sources.
