|High-performance liquid chromatography of blue and purple indigoid natural dyes|In: Journal of the Society of Dyers and Colourists. Wiley: Bradford. ISSN 0037-9859, more
Four major components of blue and purple natural dyes of the Indigoid class were separated and spectrally characterised by high-performance liquid chromatography: indigotin, indirubin, 6-monobromoindigotin and 6,6'-dibromoindigotin. It has been shown for the first time that a dyeing with a hypobranchial glandular secretion of Murex trunculus L contains indigotin and both its mono-and di-substituted brominated derivative. The analytical features presented may be used to study the composition of old dyes on yarns.