Brass make brass was not recognised as a metal. The King James Bible makes many references to "brass". The Shakespearean English form of the word 'brass' can mean any bronze alloy, or copper, rather than the strict modern definition of brass. The earliest brasses may have been natural alloys made by smelting zinc-rich copper ores. By the Roman period brass was being deliberately produced from metallic copper and zinc minerals using the cementation process, and variations on this method continued until the mid-19th century. It was eventually replaced by speltering, the direct alloying of copper and zinc metal which was introduced
Industrial metal Hard Rock Video), and Marilyn Manson's output with Richard Kern and Floria Sigismondi. NIN later collaborated with Bill Viola for live accompaniment. Trent Reznor also produced the soundtracks for the films "Natural Born Killers" and "Lost Highway", and served as "musical consultant" for "Man on Fire". Rob Zombie has directed three films. As of 2009, Marilyn Manson is in the process of directing "". Other films that have included prominent contributions from industrial metal artists include "The Crow", "Johnny Mnemonic", "Spawn", "The Matrix", "Blair Witch" and "A.I. Artificial Intelligence". Its emphasis on transgressive themes has made a few industrial metal