The origin of intense red staining on fabrics contaminated by sunscreen and treated with bleach has been attributed to an unexpected dichlorination of a common UV filter. The structure of the chromophore has been determined by NMR spectroscopy, and the proposed mechanism of its formation is supported by DFT calculations.
L. G. Smith, D. Di Leva, L. A. Shaw, E. Hughes, A. M. Kenwright, A. Beeby, M. R. Wilson and C. S. Mahon, Chem. Commun., 2025, 61, 9314 DOI: 10.1039/D5CC01593F
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