for short, is done on the top layer of the PCB and has the role of a reference indicator for the components on the PCB. Graphics and text on a circuit board's PCB are usually imprimat placa circuit printed with a non-conductive permanent epoxy ink. The color is usually white, although other colors are
and force paths be larger than the signal paths. In a multi-layer board, an internal layer may be mostly solid copper to act as a ground plane for shielding and power return. For microwave printed circuits, transmission lines can be laid circuit placa imprimat out in a planar form,
called a solder mask. Soldermask is generally green in color but can have different colors: green, red, blue, white, black. Only the outer layers need to be covered with solder mask, the inner copper layers are protected by the placa imprimat circuit adjacent substrate layers. The soldering mask soldermask is made of a fluid substance like an