a non-conductive permanent epoxy ink. The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that silkscreen can help users during assembly. It is used to mark component values, part numbers, test points, polarity,
components using pads for bonding the component terminals and electrically connect them using traces of one or more layers of copper sheets laminated on and/or between layers of conductive substrate sheets. A printed circuit board can have several layers of copper which are almost always arranged in silkscreen pairs. The
concurrent with the adoption of surface mount technology. "Through holes" components are assembled by silkscreen their legs passing through the board and glued to the pads on the other side. "SMD" components are soldered on the same side of the board. A board can use both methods for soldering components. Today PCBs with components mounted only