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. 2019 Jul 5;19:162. doi: 10.1186/s12906-019-2574-9

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Infrared spectrum of teething necklaces. a Crushed amber beads were analysed by infrared spectroscopy, measuring transmittance in the wavenumber range of 500–3100 cm^− 1. b Historical data on the infrared spectrum of Baltic amber was gathered from Beck et al (1956) [17] and adapted using the WebPlotDigitizer v3.21 tool for comparison