Laser marking and laser engraving services use a computer-controlled laser beam to discolor the surface of a component, or engrave it by vaporizing the material. The laser can be positioned and controlled very accurately, allowing for a variety of effects to be achieved. Laser marking services and laser engraving services differ in terms of material capabilities and printing capabilities. Materials that can be marked and engraved with lasers include: metals, plastics, rubber, glass, stone, marble, granite, foam, and composites. Some laser marking services and laser engraving services print company logos or graphics onto products or packages. Others apply semi-permanent markings, often by stamping with inks that can be washed away with special solvents. Many laser marking and laser engraving services print bar codes, matrix codes, universal product codes (UPC), or serial numbers for product identification purposes. Companies that print certification or regulatory symbols enable manufacturers to indicate compliance with standards from organizations such as Underwriters Laboratories (UL), the Canadian Standards Association (CSA), or the Council of Europe (CE).