The colouring matter, which is soluble in alcohol and ether-alcohol, but not in pure ether, is precipitated by lead-acetate, decolourised by reducing agents, and recovers its red colour on exposure to the air, just like litmus and the red colour of wine (De Luca and Ubaldini, in Watfs' Did., vi., ist Supp., 608.)."
A substance with a red pigment that is soluble in alcohol-ether mixtures but not pure ether is precipitated by lead acetate, bleached by reducing agents, and regains its color when exposed to air, much like litmus and the reddish hue of wine (De Luca and Ubaldini, in Watfs' Did., vi., ist Supp., 608.).