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 his introduction to "The Gangster Film", Hardy noted that work on a crime-themed “companion work” to that volume was in preparation. This book was to be devoted to private eyes, femmes fatales, murderers, and serial killers. To date, no such volume has been published. The first book in the series, "The Western", had laid out the complete plans for all future volumes. In addition to the published Western, Science Fiction, and Horror volumes, the remaining six “forthcoming” books were to be: Comedy, Romance, War, Epics, Musicals, and Thrillers. The Aurum Film Encyclopedia The Aurum Film Encyclopedia is a multi-volume reference