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.
Lost-wax casting is the process by which a duplicate metal sculpture is cast from an original sculpture. Dependent on the sculptor's skills, intricate works can be achieved by this method. The oldest known examples of this technique are the objects discovered in the Cave of the Treasure hoard in southern Israel, and which belong to the Chalcolithic period. Conservative estimates of age from carbon-14 dating date the items to c. 3700 BC, making them more than 5700 years old. Though the process to