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. 2021 Jul 2;13(7):125. doi: 10.1007/s12520-021-01378-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Microstructures. Belt clip inv.no. UF-22692.1652 from Prigglitz: a Etched with Klemm II. Coring and fine equiaxed grains of α-solid solution with annealing twins. Rod inv.no. UF-22692.912 from Prigglitz: b Etched with Klemm II; much (α + δ) eutectoid and Cu-drops are visible. c SEM image. Note the Cu-drops and the massive (α + δ) eutectoid. Wire ID S013 from Kammerwandgrotte: d Etched with ferric chloride. Complete cross-section. Note the smaller grain size on the outside. Prigglitz, bracelet (inv.no. UF-22692.1780): e Unetched. Note the copper drop and the presence of (α + δ) eutectoid. The CuFeS-inclusions are not deformed. Pottschach, pin (inv.no. 72.488): f Etched with ferric chloride