The work of Henri Braconnot in 1777 and the work of Christian Schönbein in 1846 led to the discovery of nitrocellulose , which , when treated with camphor produced celluloid .
The work of Henri Braconnot in 1777 and the work of Christian Schönbein in 1846 led to the discovery of nitrocellulose . Nitrocellulose treated with camphor makes celluloid .