METHOD FOR PRODUCING GEL AND HIGHLY VISCOUS SOLUTION OF TANNIN

摘要

More effective use of a tannin is achieved by providing it with new physical properties. Specifically disclosed is a method for producing a gel or highly viscous solution which is characterized in that at least one substance selected from boric acids, phosphoric acids and water-soluble salts of them is added and mixed into an aqueous tannin solution as the first gelatinizer, and then an alkali metal salt or an alkaline earth metal salt is added thereinto as the second gelatinizer and the resulting mixture is stirred.