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(a) Bright field and fluorescence image of “Self-Portrait with Grey Felt Hat”, Vincent van Gogh, 1887/88 (Scale bar: 500 μm). (b–e) Confocal fluorescence observation of absorption characteristics of spiropyran in an ETPTA polymer matrix (Scale bar: 100 μm); (b) side view, (c) top view, and (d) top view in bright field microscopy image after exposure to UV light and (e) to normal light.
