Most of the jewellery I make is oxidized. Sterling silver, bronze and copper will oxidize naturally on contact with air producing that familar dark patina which can be removed by polishing. This natural oxidation process normally takes place over a long period of time but it can be achieved instantly by using liver of sulphur. Liver of sulphur is a mixture of potassium sulphides and as the name suggests smells like rotten eggs (think stink bombs!) It works by turning sterling silver dark grey and copper and bronze black which is then cleaned up using wire wool. Any recessed areas such as embossed designs, coils of wire or etched patterns are left darker creating a contrast in the metal and that lovely "antique" patina.