Fig. 2
From: Reflectance spectroscopy reveals mineralogy and preservation of ceramics from the Bidong Shipwreck
Component loading and mineral fit of sherds and powder sample for visible range (400–700 nm). (a) VPCA loading 1 for sherd sample (representing 32.01% of the spectral variance in the calibration data set) is similar in shape to the first derivative spectrum of illite. (b) VPCA loading 2 for sherd sample (representing 29.38% of the spectral variance in the calibration data set) is similar in shape to the first derivative spectrum of diopside. (c) VPCA loading 3 for sherd sample (representing 28.71% of the spectral variance in the calibration data set) is similar in shape to the first derivative spectrum of chrysocolla. (d) VPCA loading 1 for powder sample (representing 66.02% of the spectral variance in the calibration data set) is similar in shape to the first derivative spectrum of pyroxene. (e) VPCA loading 2 for powder sample (representing 26.21% of the spectral variance in the calibration data set) is similar in shape to the first derivative spectrum of chalcopyrite.
