One layer at a time

For a masterpiece filled with subtle colors, fine lines and overlapping washes, the number can quickly mount. One of the most demanding examples is Night Revels of Han Xizai, a celebrated court painting from the 10th century, traditionally attributed to artist Gu Hongzhong of the Five Dynasties and Ten Kingdoms (907-960) period. The work depicts a series of music, dancing, drinking, and social scenes from an evening gathering at the home of Han Xizai (902-970), a prominent official.

Rongbaozhai says its reproduction required 1,667 separate registrations. The tiny lines of facial hair, the delicate patterns on clothing, and the changes in ink density must all be re-created through successive impressions.

That sounds straightforward until one considers what is actually being divided. A brushstroke is not simply black or white. It may contain color gradations, pressure differences, and deliberately blurred edges. A barely visible wash may be essential to the painting's character.