Tannins and human health: a review. Chung KT, Wong TY, Wei CI, Huang YW, Lin Y. Department of Microbiology and Molecular Cell Sciences, University of Memphis, TN 38152, USA. Tannins (commonly referred to as tannic acid) are water-soluble polyphenols that are present in many plant foods.
How to Cast Jewelry. Jewelry casting is a process of making jewelry pieces that involves the pouring of liquid metal alloy into a mold. It is usually referred to as lost-wax casting because the casting mold is created using a wax model that is melted away to leave a hollow chamber in the middle of the mold.
A technique for casting sculptures or other objects in metal. A model of the object to be cast is created in wax, fitted with wax rods, then encased in a heat-resistant material such as plaster or clay, leaving the rods protruding. The ensemble is heated so that the wax melts and runs out (becoming the lost).