Fig. 1From: Baltic amber teething necklaces: could succinic acid leaching from beads provide anti-inflammatory effects?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 comparisonBack to article page