: An early plastic made from nitrocellulose and camphor. It is famously highly flammable and was the standard material for motion picture film until the mid-20th century.
: A powerful solvent commonly used to dissolve plastics or clean metal parts. [S4E4] Windmill Acetone Celluloid Firing Pin
To understand the article's subject, we must dismantle the individual elements of this cryptic string: : An early plastic made from nitrocellulose and camphor
: The critical component of a firearm's mechanism that strikes the primer to discharge a round. The "Improvised Engineering" Context [S4E4] Windmill Acetone Celluloid Firing Pin