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Procedures for the analysis of (a) powder and (b) lipstick samples by paper spray ionization. MS/MS spectra for (a) Sudan Red I (precursor m/z 249) and (d) Sudan Red II (precursor m/z 277) spiked in powder and (e) Sudan Red III (precursor m/z 353) and (f) Sudan Red IV (precursor m/z 381) spiked in lipstick, each at 50 μg/kg.
