On Apr 9, 9:11 pm, "Dave Plowman (News)" wrote:
I have a rather poor quality but full size print of a printed circuit
board I wish to duplicate. It's on cheap thin paper with printing on the
other side. My scanner gives the best results when using grey rather than
B&W. But of course shows the print on the other side.

Put a sheet of black paper on the other side when scanning. That will
hide the printing. Unless your scanner has a black lid like mine!