This analysis shows the λmax of mauveine A at 549nm, highlighting issues with TD-DFT predictions suggesting orange.
My previous post on the topic of mauveine left the outcome dangling. Put simply, λmax is measured at about 549nm for mauveine A, but was calculated at about 440nm using a modern method for predicting colour (TD-DFT). According to the colour table below, that would make it orange, not mauve.
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Henry S. Rzepa (2011) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: