Receiving and unpacking new acquisitions can be an exciting but also nervous moment for a Gallery conservator.
This is the first opportunity to catch a glimpse of the artwork you have heard so much about from your colleagues, but you are also well aware of the risks involved with transporting artworks, and this is the moment where any misfortunes that have occurred along the way will be revealed. This was the case with a new addition to the Asian art collection, a 19th century Nepalese scroll painting, when it arrived at the Gallery. We cautiously unwrapped the framed artwork only to discover that its mounting system had failed en route. Fortunately it suffered no permanent damage, however, required some conservation work before it could be displayed in its new surroundings.
What went wrong with the mounting system? When I opened the frame I discovered the scroll had been stuck down directly to a board using both silicon adhesive and double-sided sticky tape. The board’s paper covering had ripped with the weight of the scroll, leaving both adhesive and paper residues attached to the back of the artwork. The adhesives remained firmly attached to the back of the artwork and didn’t want to release their grip.
All residues of these non-archival adhesives needed to be removed before they could leave lasting stains on the artwork. The artwork had to be turned face-down in order to do this, so any loose paint fragments on the front needed to be secured first. Although it is in very good condition considering its age, there are some cracks and small areas of missing paint along the edges, with some loose paint fragments in these areas.
I tested different adhesives to determine what would best hold the fragments in place, and not cause staining to the surface. Eventually I chose methylcellulose, which is a polymeric substance widely used in the food and cosmetics industries as a thickener and emulsifier. Conservators sometimes use it as a mild adhesive, as it is easily reversible in water and has good ageing properties. In this case it was strong enough in a low concentration to hold down these tiny flakes but viscous enough not to flow into the surrounding area and cause staining. I applied it with a fine brush into areas of loose paint, then weighted and left the areas to dry.
Once the loose paint fragments had been secured at the front, the artwork could be safely turned over, and the adhesive-removal could begin on the back. This was a painstakingly slow process using various surgical tools (such as fine tweezers and a micro spatula) to pry the adhesive residues away from the artwork without leaving a mark.
Some help came from solvent vapours, which when carefully applied using a mini vapour-chamber softened the double-sided sticky tape. Solvent-soaked cotton wool is held securely in the top of a glass chamber. This is then placed over the residual sticky-tape for 2-3 minutes. The solvent vapours don’t have enough time to cause any damage to the artwork but soften the sticky-tape just enough to help remove it.
With the removal of one mounting system a superior solution had to be devised. The artwork was originally designed to hang by its top bamboo rod, but this would place the strain of the artwork’s weight on the top seam holding the rod. Although the seam appears strong enough to take the strain at the moment, over time gradual weakening and deterioration is likely. Instead I added a new hanging system to the back of the artwork. This comprises a new ‘hinge’ of fabric made from stable, inert materials and adhered to the back of the artwork near the top edge with a reversible heat-set adhesive.
I attached the other end of the hinge to a backing board, so now the artwork hangs suspended from this hinge, distributing the weight more evenly through the cotton support. The bamboo rods have been secured against movement by tying their ends down to the backing board. Finally the artwork and backing board have been enclosed in a protective perspex case for display.