A traditional finings or clarifier for English ales. Can be used to speed up clearing in all ales, lagers and wine.
Produced from the swim bladders of tropical and sub tropical fish. The active ingredient in isinglass is a protein called collagen, a triple helical coil with many sites of positive charge.
Generally speaking top fermenting brewing yeasts have a negative electrical charge. Because opposite magnetic charges attract each other,the negatively charged yeast cells are attracted to the positively charged collagen molecules. Many yeast cells are attracted to each collagen molecule because of the enormous difference in size and charge, becoming physically enmeshed within the collagen molecular structure. A floc is thus formed and aided by the instability of the colloidal system caused by the beer pH and gravitational forces the collagen precipitates from the beer taking enmeshed yeast cells with it and clarifying the beer.
Isinglass is the most gentle organic fining. Works very quickly and easily with little risk of stripping wine or beer of flavour. Add 50 ml per 23 litres of wine or beer.