Note the difference in color between this old commodore board and this newer board. It might seem like lighting, but after looking at my own collection of scrap boards, the older ones tend to have a much darker color than the new. I thought it might be aging on the mask, but all the old ones essentially have the same color, so I thought it unlikely.
Does anyone know the reason for this color change?
Is it a change in board material, masking chemicals, etc?