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86 FUNDAMENTALS mm. The type 330 is a favorite for reversal newsreel work. In sound recording, type 201 is used for 35 mm and 602A for 16 mm. For kinescoping, Du Pont types 602 and 605 are very popular: the former is a fine-grain film suitable for single system sound use, and the latter is a fast emulsion for regular picture use. Types 323 and 324 are also very popular for the purpose. Du Pont types 314, 324, and 301 are used for general film work for movies and television, the actual choice depending on the use contemplated, i.e., interior, exterior, or background work. Both the companies issue comprehensive booklets containing all the information needed about their film products; the reader is advised to obtain copies if he finds that he is actively in need of technical data. Safety Film The introduction of safety film has sown the seeds of possible danger in the projection booth! This appears to be a paradox, for is it not non-inflammable and therefore as harmless as water? Yes—and no! The original is, but the name "safety film" is printed along the side of the perforations and unless this de- scription appears it must be regarded as nitrate base and there- fore inflammable. That sounds very safe, but—when a print is made the legend is also printed onto the new film edge and "safety film" can be read on the edge even if it is inflammable! So, even if the label does say "safety film" if it is 35 mm stock tear off a frag- ment, take it out of doors, and try to light it. If it burns violently, it is nitrate-base stock and hence must be treated like the explosive it is. Part of a safety film may be damaged and replaced with nitrate base. If the operator is not aware of this it might be used under dangerous conditions for inflammable stock. Also, until safety film is used everywhere for every production, it is important to regard all film as being inflammable and treat it as such, for it is at a time when people become careless that the wrong film gets into a position of hazard, and tragedy results. Even the fumes are highly toxic, and if a roll really gets burning well, even water or fire extinguishers have a hard job extinguishing it since oxygen to support the flames is produced by the very action of burning.