Abstract
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.
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