Fig. 7From: Non-invasive identification of polymers in cultural heritage collections: evaluation, optimisation and application of portable FTIR (ATR and external reflectance) spectroscopy to three-dimensional polymer-based objectsFTIR spectra for a PE bottle bid ATR clamped and handheld, b PE bottle lid ER and KKT, c PP goblet ATR clamped and handheld, d PP goblet ER and KKTBack to article page