Quote Originally Posted by silveror0 View Post
How is that done? My experience has been that the etched areas show up readily when the light is reflected from the prints at an angle.
If you'd read the thread carefully, you would see that both Ian Grant and I recommend using gum Arabic (Ian's source is a gummed envelope) to mix with the spotting solution or use alone in order to get some of the sheen back that is lost when etching.

Granted, it is rarely 100% perfect, and often the etched areas are visible in glancing light, but the spots I etch and then retouch using this method are indistinguishable in non-reflective viewing light, and it sure looks better than the defect.