Quote Originally Posted by Mark Elberson View Post
You need side light (90 degrees to the scratches). You could try a flashlight or an off camera flash. That will exaggerate the scratches.

Thanks, I have considered that and it might work. I did not have a flashlight with me that day. The only drawback is that the sandstone faces are not flat and a lot of surface distortion such that the side light might not highlight all the scratches. I don't own any filters, yet. Is there a filter set that might work?