Printed circuit board
There are, however, different methods of making a circuit board. Some professionally made circuit boards use a different method to remove extra copper from the circuit board. A process called silk screen printing is used. Silk-screening is when a cloth is pulled tight over a frame. Then an image is printed onto the cloth. Then ink is pressed through the cloth. The ink does not go where the image has been printed on the cloth. It is called silk-screening because the cloth is usually silk. The cloth is usually silk because it has very small holes. silk-screening is used to print an ink called resist onto the board. Resist is an ink that resists the etchant used to make the circuit board. Etchant dissolves the copper on the board. This is cheaper for each board than photo-resist, but is more expensive in the beginning.