Fig. 4From: Paint has the potential to release microplastics, nanoplastics, inorganic nanoparticles, and hybrid materialsPhoto image (a), typical Raman spectra (b), and Raman intensity images (c–f) collected from the paint branches distributed on a glass surface. In a, the area of 10 μm × 10 μm is scanned. Raman spectra were collected under an objective lens of 100×, integration time of 1 s for each pixel of 0.33 μm × 0.33 μm (to create a spectrum matrix of 30 × 30). b Shows the Raman spectrum of ABS (with intensity off-setting for presentation), to compare with 3 typical spectra collected from the positions marked in a, and the scanning average spectrum. The intensity images (c–f) are mapped at the peak of acrylic at ~ 2910 cm−1 (c) and colourant at ~ 440 cm−1 (e), as marked under each image (and the peak width) and in b, after 20% colour off-setting. e Merges (c, d) using logic-OR. f Is another version of e, using 3D presentation and white backgroundBack to article page