To Refine Beer, Ale, Wine, or Cider
Put two ounces of isinglass shavings to soak in a quart of the liquor that you want to clear, beat it with a whisk every day till dissolved. Draw off a third part of the cask, and mix the above with it; likewise a quarter of an ounce of pearlashes, one ounce of salt of tartar calcined, and one ounce of burnt alum powdered. Stir it well, then return the liquor into the cask, and stir it with a clean stick. Stop it up, and in a few days it will be fine.