be familiar with the magazine prior to loading a "hot" (in usage) roll and able to go through with the loading operations only on touch. When learning, usually a loader will start by practicing with unusably fogged rolls ("junk" or "gash" rolls) in light and then try with junk rolls in a changing bag after feeling competent enough. The advantage of using a two chambered roll becomes most apparent when loading. Since each chamber is light-tight, a loader only needs to load the feed side in darkness - once that chamber is secured, the remainder of the loading can take place in light. The small amount of film which is exposed on the take-up side would not be used for exposure under any design, and thus is not considered a significant loss of stock. Most two chambered axial magazines have fixed loop sizes, which adds some extra time to the loading procedure, but allows for magazines to be attached to the camera with minimal or no threading required. This can be a great advantage when filming requires reloading that takes only seconds. Virtually all magazines are designed for the feed side to contain film stock wound with the emulsion facing inwards, which is the standard manufacturing wind. However, different magazines will takeup the film either with the emulsion facing out or facing in. Most magazines are emulsion in; Panavision magazines are a notable exception. Emulsion in and emulsion out are sometimes called "9P" and "99" respectively, referring to the relative appearance of a thread of film emerging from one side of core or the other. Labelling Magazines which are loaded then need to be labelled properly in order to indicate what type of film is inside, how much is loaded, which magazine it is, and what the roll number is. Although different regions and types of filmmaking may have variants as to how this is done, generally larger budget feature films follow the following labelling convention: 1000' NR 5219 117 049.01 (27.4) M# 2314 R# C54 Where 1000' indicates the amount of film loaded (this can be indicated in meters instead, region depending); NR indicates "new roll" - otherwise it must be SE "short end" or RC "re-can"; 5219 is the manufacturer's stock code (in this case 35 mm Kodak Vision3 500T color negative film); 117 049.01 (27.4) are emulsion code numbers indicating the exact information of what batch of