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I think this page should be merged with Gentian Violet since it's the same substance. Xenobiologista ( talk) 08:16, 19 May 2010 (UTC) reply

You are right!-- Stone ( talk) 10:08, 24 May 2010 (UTC) reply

The FDA article cited does not cite any sources for links to human bladder cancer. This claim should have a citation, even if the FDA is imagining pink elephants. 122.200.166.245 ( talk) 13:32, 13 August 2011 (UTC) reply

I think the articles needs a clarification of how it can work both as a way to harmlessly tag bacterias and as a bactericide agent. -- TiagoTiago ( talk) 03:18, 26 July 2012 (UTC) reply

It seems to me that, as a child, I used to have cuts and scrapes treated with "bismuth violet", and that I preferred it greatly to the more painful alternative at that time, merthiolate. But it doesn't seem to have any bismuth in it, so I'm not sure why it had that name. Is it worth connecting to the article on the metal? Shocking Blue ( talk) 08:49, 27 November 2012 (UTC) reply

The units on the extinction coefficient are M−1cm−1, but I'm pretty sure they are supposed to be nm−1, not cm-1. — Preceding unsigned comment added by 128.193.8.48 ( talk) 21:19, 22 April 2013 (UTC) reply

The units used here correct. M⁻¹cm⁻¹ is very standard - see the article Molar absorptivity. The standard path length is 1 cm or 10^-2 m. A nm (nanometer) is 10^-9 m. Aa77zz ( talk) 11:01, 23 April 2013 (UTC) reply

I was just watching the BBC TV series 'Fit to Rule' (S01E2) [1] about royal illnesses in the UK, and they talked about 'Mad' King George III who was previously thought to have suffered from porphyria as he had blue urine, but how it was now understood that that was caused by his consumption of a gentian-based medicine. So the medical use of gentian would seem to predate the 1800s. Wwwhatsup ( talk) 04:31, 7 May 2013 (UTC) reply

Isn't a pH of -1 mathematically impossible? Is that supposed to read "< 1"? Shiftingsphere ( talk) 20:02, 9 July 2013 (UTC)JE reply

• pH can have values of less than zero - but it can't easily be measured. The pH of a solution of a strong acid with a concentration above 1 Molar will have a pH of less than zero. Aa77zz ( talk) 21:03, 9 July 2013 (UTC) reply