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.
1 An eyepin is a small pin used to anchor into your charm. It is thin and long, with one pointy end and the other end molded into a small loop. The loop is the location where you can add a jump ring to connect it to your charm.  A jump ring is another metal piece used to connect an eyepin to jewelry.