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Thicken the tracks on the circuit board
This procedure is important to make sure the tracks on the circuit board are connect with each other as designed and to make sure there are no problem occurs before start with etching process. This thicken process will touch it up with a permanent marker, though the permanent marker won't be as nice a mask as the real toner from the printer. Figure below shows the process to thicken the tracks on the circuit board.
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