Silver is the brightest reflector of any metal (except for liquid mercury) and can be polished to a high sheen that even platinum can’t achieve. It has also the highest electrical and thermal conductivity of all metals, even higher than copper. Most silver is produced as a by-product of copper, gold, lead, and zinc mining. Commercial grade fine silver is at least 99.9% pure silver and purities greater than 99.999% are available. Mexico is the world’s largest silver producer which contributed 15% of the annual production of the world. Canada, Peru, Australia and the United States are the other major countries, which are producing silver.