Tetra-Iso-Extract

Tetrahop is a pure, aqueous solution of the potassium salts of tetrahydro-iso-alpha acids produced entirely from CO2 hop extract. Tetra will greatly enhance beer foam when used as a post fermentation replacement for a proportion of the normal bittering. In the absence of normal alpha and iso-alpha acids, Tetra will give virtually complete protection against development of light-struck flavours."