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a SAWN mass spectrometry (MS) spectrum and b SAWN-MS/MS spectrum of 1-mm textile fibre dyed with basic violet 3 (BV 3) in MeOH–H2O (1:1 v/v) (collision energy 65 eV). BV 1 basic violet 1, 1-PA monomethyl pararosaniline, 2-PA bimethyl pararosaniline, 3-PA trimethyl pararosaniline, 4-PA tetramethyl pararosaniline
