Diego Rivera graphite drawing
This untitled graphite figure drawing by Diego Rivera was probably torn out of a sketchbook. Outside of the protection of its covers, it became very torn and wrinkled. Now that it has been lined with tissue, the drawing can be handled and displayed.
Pith painting
These watercolor birds are not actually painted on paper. The support is a pith sheet, which had broken in a few places, but luckily not within the image. After examining this object for a technical & historical report, it was later considered for treatment and required special considerations.
Constructivist-style watercolor
This opaque watercolor painting on paper in a Constructivist style had been mounted to an acidic backing board that was becoming brittle. After backing removal, the paper was in a fragile state as it was also very brittle. Because the media and paper were both sensitive to water, a non-aqueous lining method was chosen to give the paper support.