ISO 17131:2020 pdf free.Leather – Identification of leather with microscopy. 4 Principle A cross-section of the material is cut perpendicular
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ISO 22284:2020
ISO 22284:2020 pdf free.Leather- Raw skins – Guidelines for preservation of goat and sheep skins . 4 Characteristics of salt
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ISO 17072-1:2019 pdf free.Leather——Chemical determination of metal content——Extractable metals. WARNING — The concentrated acids used in this method are very
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