Here's another tip to address frequently asked AutoCAD questions. This one comes from Chris Miller, AutoCAD Test Development.
Could you please tell me why the xref layout in paper space shows dimmer than it is in the xref itself and how can I correct it to show the same brightness in the drawing as it is in the xref.
Please try the XDWGFADECTL setting. This setting controls general XREF fading and by setting it to 0 DWG XREF objects will not appear faded.