“Oiliness” means a lasting feel, not applied oil

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

In collector usage, oiliness describes a warm, fine, smooth feel that remains comfortable through handling. It does not mean visible oil on the surface. Gloss, slipperiness and fast colour change are not equivalent. The article encourages judging the underlying shell and long-term surface response rather than adding oil to manufacture the appearance.