Explanatory notes
… the word “photographic” relates to the process by which visible images are formed, directly or indirectly, by the … developed (that is, chemically treated to render the image visible). Plates and film remain in the Chapter whether … used for the duplication of further positives), or reversible (i.e., with special emulsions which permit the …Legal note
… the word “photographic” relates to the process by which visible images are formed, directly or indirectly, by the …