By evaporation the green vitriol is obtained as large crystals.
Fuming or Nordhausen Oil of Vitriol, a mixture or chemical com pound of H 2 SO 4, with more or less S03, has been made for centuries by exposing pyritic schist to the influence of atmospheric agents, collecting the solution of ferrous and ferric sulphate thus formed, boiling it down into a hard mass ("vitriolstein") and heating this to a low red heat in small earthenware retorts.
With the BNP throwing perhaps more vitriol at Kilroy and UKIP than any other party, it was clear he had them worried.
Many of his former colleagues in the Tory Party and the Tory press have heaped vitriol on him.
Lemery in 1675 by distilling green vitriol.