PCB positive and negative films are the result of the reverse manufacturing process.
PCB effect of the film: where the lines of the printing plate of copper is retained, there is no line where the copper is cleared. Such as the top layer, the bottom of the signal layer is positive.
The effect of the PCB negative: Where the line is printed on the printed copper plate is cleared, there is no place to paint the copper but was retained. Internal Planes (internal power supply / ground plane) (referred to as the internal layer), used to arrange the power cord and ground. The traces or other objects placed on these levels are galvanized areas, ie the working layer is negative.
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