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We must identify print processes only by their evident composition and not by their secondary caracteristics. We must identify an albumen print by having certitude of the presence of a two layer only process with a yellowish binder and a image that are over the paper fibers even with these are partially visible and not by their yellow aspect, size and secondary mount. In the same hand, platinum prints are a one layer process where the real solid image are formed between the paper fibers. Dating are not significant in these cases since the end of the 19th century is the period where albumen, mate collodion, gelatin, gum, platinum and more based images shared market, format and styles.
Is a period where textures where intentionally reproduced and imited, not only old formats and styles. We must always find evidence of a binder, baryta layer, etc, in order to be sure.