Bentonite KWK is a high colloidal clay of the montmarillonite group found in the cretaceous beds near Fort Benton in Montana. Primarily used to stabilise wines against precipitation of soluble grape proteins.

Bentonite WG is a high colloidal clay of the montmarillonite group found in the cretaceous beds near Fort Benton in Montana. Primarily used to stabilise wines against precipitation of soluble grape proteins.