It's to paint directly on the canvas without any funny business as it were and I use almost pure turpentine to start with adding oil as I go along until the medium becomes pure oil. I use as little oil as I can possibly help and that's my method.
But I don't think there has ever been anything written on the nature of violent man as deep and as thorough as Shakespeare's Titus. I think it puts all modern movies and modern exploitations of violence to shame.