Non-conductive epoxy ink is silkscreened onto one or both sides of the panel depending on the requirements of the customer.Or, it is printed out by laser machine.
The printing usually dictates the component placement, part number or name, date code, logo or other specified information. PCB Panels are then baked to cure the ink.
Common PCB silkscreen color: White,black,red,yellow.
WELLER normally use silkcreen ink Tamura DSR 330 to ensure a high quality of legend printing. And we are upgrade the printing machine to laser printing to get a bettter quality.