Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
The Aurum Film Encyclopedia The Aurum Film Encyclopedia The Aurum Film Encyclopedia is a multi-volume reference work on cinema, published in the UK by Aurum Press and edited by Phil Hardy. The first volume, devoted to western films, appeared in 1983, with eight subsequent volumes announced at that time as "forthcoming". However, only three additional entries were issued. All four volumes have been published in the U.S. by The Overlook Press, with the same contents as the UK editions but with the title changed to The Overlook Film Encyclopedia. The Foreword to all four volumes is the same, describing the proposed nine-volume encyclopedia as