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(a) Microplastics and other undigested matter extracted from human faeces on a stainless-steel sieve with 30 μm pores, (b) a two-dimensional array of colour-coded microplastics generated with an automated Raman mapping approach at a spatial resolution of 28.4 µm, and (c) the superimposed image of (a) and (b) to locate these particles, which were confirmed to be polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC) and polyethylene terephthalate (PET).
