Speculum metal metal mixtures usually contain two parts copper to one part tin along with a small amount of arsenic, although there are other mixtures containing silver, lead, or zinc. The knowledge of making very hard white high luster metal out of bronze-type high-tin alloys may date back more than 2000 years in China although it could also be an invention of western civilizations. Such metals were used in sculpture and to make more effective mirrors than the more common yellow easily tarnishing bronze mirrors. In that era mirrors of speculum metal, or any precious metal, were rare and only owned by
Industrial metal repudiate the industrial label. Sales remained high throughout 2000–2005; at least 10 million records were sold during that time frame. Many groups began to take influence from hip hop and electronic music, in addition to industrial metal. As a result, acts like Powerman 5000 are often described as industrial metal as well as nu metal. Several industrial metal groups have produced eye-catching videos. These include Godflesh's collaboration with Andres Serrano, Aidan Hughes's graphics for KMFDM, Nine Inch Nails' work with Mark Romanek, Rob Zombie's visual work for White Zombie (for which he received the MTV Video Music Award for Best