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Silkscreen, also known as legend, refers to the text-based, human-readable information that printed on the surface of a printed circuit board, which seems like the signature of PCB board. The decals and reference designators in epoxy ink on a printed circuit board so called because of the method of application - the ink is "squeegeed" through a silk screen, the same technique used in the printed of T-shirts. Silkscreen information can include component identifiers, component reference designators, company logos, switch settings, test points, other instructions, part numbers, version numbers, etc.
Traditionally, PCB silkscreen is processed with a traditional PCB screen printing process. But with the development of silkscreen, increasingly, silkscreen adopts a new and advanced custom-built digital printer with an ink-jet technology. For PCB express quick turn product, white is the standard silkscreen color. Other DIY PCB silkscreen colors (black or yellow) are also available in ALLPCB.com.