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. 2023 Nov 17;18(11):e0289728. doi: 10.1371/journal.pone.0289728

Fig 8. The a* and b* values of the analysed patinas on the Japanese artefacts (black, square symbols) and of the experimental patinas (red, dot symbols).

Fig 8

The ellipses represent groups of similar composition. Error bars indicate standard deviation of 5 measurements.