Liquid Isinglass. 1.5 oz (45 mL) package.
Isinglass is used as a clarifier in both beer and wine production, coagulating yeast and other particles into a mass that will drop to the bottom of the fermenter. It is obtained from the swim bladders (air bladder) of fish, usually cod or sturgeon.
Usage: add package to 5-6 gallons of beer or wine, stir thoroughly, wait 2 weeks, then rack off beer or wine.