The DX number is assigned by the International Imaging Industry Association (I3A). It uniquely identifies the type and manufacturer (sensitizer) of a film emulsion. A proprietary list of DX numbers for APS and 135 film is prepared yearly or as needed. (DX Codes for 135-Size Film, 2004, I3A). The list is available for sale from the I3A.
Read more about DX Number: DX Number Composition, DX Barcode
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