Gold has been used for centuries for jewellery and decoration. In addition to the more familiar rings, brooches, necklaces, and ear rings, gold is used as gold leaf for decoration and protection, screen printing (directly on to bone china, earthenware, porcelain, and glass surfaces or decals). Gold is the key component for "liquid gold", preparations containing up to 12% gold ideal for decorative application using brushes and gold pastes used for screen printing. The UtiliseGold directory contains many links to gold suppliers and products for these gold applications and those outlined below.