Valentina Marabini, British Museum
As promised in a previous post, I will now describe the last stages of the conservation of a painting and how it is turned into a hanging scroll, which can be safely rolled for storage. This process is called zhuang hua.
After the painting has been lined with paper and framed with mounting silk, it is stretched and adhered by narrow margins onto a wooden drying board. It is left there to dry for up to five months, depending on the age and condition of the painting. Following this period, the flat and slightly stiff assemblage of the mount and the painting is detached from the drying board using a thin bamboo spatula and placed face down on the red lacquer table ready to be burnished.
A thin layer of wax is applied to the verso – or back – of the painting and this is then gently burnished (polished) with a smooth river stone. This process produces a beautiful smooth, glossy surface on the back of the scroll. The application of the wax and the burnishing compresses the scroll layers and closes the pores of the paper, thus providing the scroll with flexibility and stability.
The last step of the mounting process is the fixing of the original top stave, tian gan, and bottom roller, di gan, or, if necessary, replacements custom-made from cedar wood. The shape and diameter of these are proportional to the dimensions of the scroll.
Small holes are drilled perpendicularly in the top stave and hand-made, copper hooks, ji jiao, are carefully stapled and secured inside it. A cotton cord, shen zi, is inserted inside the hooks and secured with two rods respectively at the extremities.
The two sides of the wooden stave are covered with the same plain silk used to mount the scroll. These are called fengtou.
The same silk is used to produce three thin strips that are pasted to close the loose ends of the cord at the edges. The choice and thickness of the strips illustrated here are characteristic of the Yan Ban Su Ban School style adopted by the Shanghai Museum team.
Special open silk called bai lin dai is laminated with flour paste and left to dry overnight. It is then cut into strips, folded in four and sewn to form a ribbon called dai zi. This is tied at the centre of the cord to fasten the hanging scroll.
The bottom roller is selected for its weight. Both ends of it are worked with a special knife, each to form a point. Two hollow hardwood mahogany pommels called zhou tou are then fixed onto the wooden rod ends by forcing them in with a wooden hammer. As with the rest of the mounting process, the precision required at this point is paramount!
The scroll can now be rolled, using the pommels, and secured with a ribbon or unrolled and hung as a hanging scroll or lizhou.