IS 15 is a cold soluble gelatin, with 80% of the proteins contained with a molecular weight of 15 000 daltons. It is very reactive to tannins with bitter and astringent properties. IS 15 is used for wines rich in this type of tannin.

IS 15 is a cold soluble gelatin, with 80% of the proteins contained with a molecular weight of 15 000 daltons. It is very reactive to tannins with bitter and astringent properties. IS 15 is used for wines rich in this type of tannin.