Fig. 21From: Identification of an unusual pale green material on the surface of an ancient Chinese bronze vessel and application of laser cleaning to its removalSpectral Angle Mapper (SAM) classification was used. a and c: before cleaning; b and d: after cleaning. The rectangular I: area cleaned with laser-chemical method; the rectangular II: area cleaned with manual-chemical method. The colors indicate the same materials as in Fig. 20Back to article page