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. 2018 May 9;57(25):7401–7407. doi: 10.1002/anie.201713413

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© 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Linear calibration (y=m x) of the Plextol acrylic binder (a) and PG18 (hydrated chromium oxide green) pigment (b) obtained by ATR‐FTIR results of the reference samples (C7–C9, GP1, GP3, see Table 9): a) Plextol band areas of the main functional groups of acrylic binder versus relative concentration of binder of the reference samples. b) PG18 band areas of the main functional groups of hydrated chromium oxide green versus relative concentration of PG18 of the reference samples. Grey and black dotted lines represent the prediction and confidence bands, respectively.