a flux and a mercury salt extended. This can be applied by a painting technique. From the kiln, the decoration is dull and requires burnishing to reveal the full colour Acid Gold – a form of gold decoration developed in the early 1860s at the English factory of Mintons Ltd. The glazed surface is etched with diluted hydrofluoric acid prior to application of the gold. The process demands great skill and is used for the decoration only of ware of the highest class. Bright Gold – consists of a solution of gold sulphoresinate together with other metal resonates and a flux. The name derives from the appearance of the decoration immediately after removal from the kiln as it requires no burnishing Mussel Gold – an old method of gold decoration. It was made by rubbing together gold leaf, sugar and salt, followed by washing to remove solubles Underglaze decoration is applied, by a number of techniques, onto ware before it is glazed, an example is blue and white wares. Can be applied by a number of techniques. In-glaze decoration, is applied on the surface of the glaze before the glost firing. On-glaze decoration is applied on top of the already fired, glazed surface, and then fixed in a second firing at a relatively low temperature. Glazing Glaze is a glassy coating on pottery, and reasons to use one includes decoration, ensure the item is impermeable to liquids and minimise the adherence of pollutants. Glaze may be applied by spraying, dipping, trailing or brushing on an aqueous suspension of the unfired glaze. The colour of a glaze after it has been fired may be significantly different from before firing. To prevent glazed wares sticking to kiln furniture during firing, either a small part of the object being fired (for example, the foot) is left unglazed or, alternatively, special refractory "spurs" are used as supports. These are removed and discarded after the firing. Some specialised glazing techniques include: Salt-glazing - common salt is introduced to the kiln during the firing process. The high temperatures cause the salt to volatilise, depositing it on the surface of the ware to react with the body to form a sodium aluminosilicate glaze. In the 17th and 18th centuries, salt-glazing was used in the manufacture of domestic pottery. Now, except for use by some studio potters, the process is obsolete. The last large-scale application before its demise