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. 2021 Feb 8;11:3316. doi: 10.1038/s41598-021-82806-z

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© The Author(s) 2021

Open Access This 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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(a) Firing temperature estimation via the refiring approach. Change in absorptivity ratio with increasing firing temperature is plotted for six artifacts subjected to laboratory refiring. The top three curves are moulds (M), and the bottom three are cores (C). Error bars represent the standard deviation among three samples measured per artifact; (b) Firing temperature estimation via the calibration curve approach. Absorptivity ratio values are plotted for the six artifacts analyzed using the refiring approach (colored data points; shapes/colors correspond to those used in (a)) and for the eight artifacts not subjected to refiring (unfilled circles). Four clusters (A-D) are identified and correlated with firing temperature estimates made using the refiring approach.