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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. 4 — Microstructures. Knife inv.no. 72.484 from Pottschach: a Etched with ferric chloride. Note the elongated CuFeS-inclusions and the deformed grains of α-solid solution with deformed twins and strain lines. b Knife inv.no. 72.485 from Pottschach: b Unetched. Note the copper drops in the matrix, surrounded by corrosion. c Etched with ferric chloride. Knife inv.no. 10.964 from Prigglitz: d Etched with ferric chloride. Note the slightly deformed twins and strain lines of the polyhedric grains of α-solid solution. Also, the (α + δ) eutectoid is present. Knife inv.no. UF-22692.2188 (22.692) from Prigglitz: e Unetched. Slight coring is visible. f Etched with ferric chloride. Note the deformed polyhedric grains of α-solid solution with twins and strain lines