Yellow patches, concealed yellowing and small repairs

This is an English reading overview of the Chinese article, rather than a complete translation. The Chinese source has been updated since this overview was prepared; consult the original for the latest details.

The central idea

A local yellow patch differs from the normal overall colour of a fresh walnut. It may darken along a yellow path instead of developing like the surrounding surface. A small, appropriately located patch may be addressed by limited, disclosed repair. Concealed yellowing can become visible later; assess the location, structure and records rather than making a blanket judgment.