isinglass finings are widely used as a processing aid in the british brewing industry to accelerate the fining, or clarification, of beer. it is used particularly in the production of cask-conditioned beers, although a few cask ales are available which are not fined using isinglass. the finings flocculate the live yeast in the beer into a jelly-like mass, which settles to the bottom of the cask. left undisturbed, beer will clear naturally; the use of isinglass finings accelerates the process. isinglass is sometimes used with an auxiliary fining, which further accelerates the process of sedimentation.