Film stock is a type of photographic film used for motion pictures. It is made of a cellulose ACETATE base, which is a plastic material that is highly flammable and can be easily cut and spliced together. ACETATE is the most common type of film stock used in filmmaking today. It is also known as safety film because it is less flammable than other types of film stock. ACETATE film stock is also more resistant to scratches and other damage, making it a popular choice for archival purposes.