Lacquer spraying the surface of a jade piece is another type of enhancement that is commonly practiced among jade sellers, especially those selling jade pendants, bangles and figurines on road-side make-shift stores, under major bridges of cities and nook and corner back-lanes.
The lacquer used is mostly a type of olefin oil such as ethylene, which is also an alkene compound with only one C-C double bond. It has a distinctly smell to it, like paraffin.
The most tedious work for a lapidary or jade sculptor is the final polishing of jade, whereby the jade piece is polished with very fine diamond paste or diamond sanding paper of fine grit to give the jade surface the shine and luster. Pre-forming a jade piece, cutting a jade piece into a figurine stature or a motif pendant can be done quite easily in the hands of a dexterously master craftsman. But the final polishing takes up time and requires a lot of passion and patience on the master craftsman.
The picture above is a carving of two cranes on a lotus pond. The maximum width is about 10 inches and height is about 9 inches. This is an intricately carved piece of Type A Jadeite Jade. The pre-forming and the sculpture outlay may take a master craftsman 2 to 3 months, but the polishing part may take a much longer time.
Polishing a broad surface may be easy. For jade carvings the crevasses, the grooves and the hollow-out part of the motif are the most difficult as these areas are small and hard to access with a small drill bit. Hence, a number of these are left as it is.
With the lacquer spray, the oil will hide the unpolished grooves as shown in the pictures.