"Bentonite Finings" is a very fine clay used as a fining or clarifying agent in wine to remove protein, to achieve heat stabilization or to remove another fining agent.
50 grams (1.8 oz.)

Bentonite (Vitiben) is a proprietary wine fining granular bentonite manufactured by Bentonite Performance Minerals, one of the largest bentonite supplier in the USA.
DIRECTIONS: Add 1/2 tsp. (2.5g) per gallon (4L) of must at the start of fermentation.