Specim's FX50 camera operates in the mid-wavelength infrared (MWIR) range from 2.7 to 5.3 μm, corresponding to a wavenumber range of 4000 to 1880 cm-1. This enables the sorting of different materials, e.g. in the field of plastic recycling. A not insignificant proportion of plastic products are coloured black for a variety of reasons, e.g. because black pigments can mask surface defects, but also because they increase light stability.