<<Disclaimer: Verify this information before applying it to your situation.>>

According to " A Consumer's Dictionary of Food Additives," bentonite
is: "A colloidal clay (aluminum silicate) that has a high swelling capacity
in water.  Used as a food additive, as a thickener, and as a colorant in
wine.  Poison if given by vein, causing blood clots, and may cause
tumors."

Nancy