The properties of hematine explain the mode of using logwood.
Sulphurous acid destroys the colour of solution of hematine.
hematine precipitates glue from its solution in reddish flocks.
hematin he·ma·tin (hē'mə-tĭn)
A blue to blackish-brown compound formed in the oxidation of hemoglobin and containing ferric iron. Also called ferriheme, oxyheme, oxyhemochromogen.