Liquid chromatography–mass spectrometry analysis of cationic aniline dyes from the Technical University of Dresden Historical Collection of Dyes

Acknowledgements We are grateful to Prof. Dr. Horst Hartmann of the Historische Farbstoffsammlung, Technische Universitat Dresden and to the Chandler museum, New York, for samples to analyse. Declaration of conflicting interests The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. Funding The author(s) received no financial support for the research, authorship, and/or publication of this article.