if extracted with benzene at a suitable pH, pass into the benzene medium, very often with a change of colour. This communication reports our preliminary results with methylene blue.

The EPA’s new leadership continues to defend last year’s rule that banned most uses of methylene chloride, marking a step towards a ruling on amendments Congress made in 2016 to the nation’s primary ...

Crystal violet showed about the same selective and bactericidal action as gentian violet. 3. Methylene blue as made up for staining showed little or no bactericidal action, the percentage of alcohol ...