By photographing photographs with a stippled surface underwater much of the stippled surface can be removed.

Original Print copied

Detail Bottom Right

Image copied underwater

Detail of image copied underwater

Removing these white areas from the stippled paper can also be achieved in Photoshop

Removing noise with photoshop

1. Filter
2. Noise
3. Dust & Scratches
4. Radius 4 threshold 7 OK

Detail of Photoshop image