Grape Tannin 1 LB - adjusts tannin levels when necessary (gives pucker you taste on roof and back of your mouth. Dry form of premium Slovakian wine tannin from the heart of the European/Spanish Chestnut tree. Use 1/4 teaspoon per gallon for white or rosé wine must: 1/3 teaspoon per gallon for red wine must; 1/2 teaspoon per gallon for fruit wine must. Only common use is in NON-GRAPE recipes, since grapes contain natural tannins.