Fining or Clearing
For fining or clearing the wine use one quarter pound of isinglass, dissolved in a portion of the wine, to a barrel. This must be put in after the fermentation is over, and should be added gently at the bung-hole, and managed so as to spread as much as possible over the upper surface of the liquid; the intention being that the isinglass should unite with impurities and carry them with it to the bottom.