This is a Harry Worthman pastel. Notice the tears along the top edge, and missing pigment near the collar.
Charcoal/pastel original art.
The tears are repaired, along with the loss of pigment, and it is much brighter and fresher looking.
Brownish color on skirt is original to the piece, and was almost undetectable before treatment.
This is a family tree, ink on very brittle paper. It is now lined, and most of the dark stain is removed.
This is a pencil and ink drawing, by Olin Travis. Terrible staining and acid burn.
You can now see what Mr. Travis was drawing!