Stone Chemical Company Specializes in anodizing additives and seals, as well as specialty chemicals for cleaning, brightening, and preventing tarnish on copper, brass, bronze, and other nonferrous metals. http://www.stonechemical.com/

Systematics, Inc. Offers chemical management programs, electroplating instruments, controls, meters, feeders, and alarms for the plating industry. http://www.systinc.com/

Triple-S Chemical Products Inc. Offers extensive range of coatings and plating chemicals for metal industry. Includes decorative and antique finishes, as well as cleaning, brightening, and anodizing agents. Site provides detailed product information. http://www.patinas.net

Zinex Corporation Offers rectifiers, transformers, and plating products designed for minimal environmental impact. Applications include brass, bronze, copper, chrome, and precious metal finishes. Site describes features and benefits. http://www.zinex.com