The SW-NIR transmittance spectra were obtained at four positions at the equatorial points 90° apart. After the SW-NIR spectral measurement was complete, the peel of each sample was slit with a sharp knife perpendicularly to the stem-calyx axis and carefully opened to investigate internal defects such as translucent flesh. The mangosteen was considered to have translucent flesh disorder when the translucency was visibly apparent. Photographs were taken with a digital camera (Fujifilm, FinePix F700, Japan), then the flesh and seeds were cut through and the fruit was re-photographed in order to record the internal features at each position of measurement as shown in Fig. 2(a and b). The fruit size and number of seeds of each sample were also recorded in order to study the influence of variation of fruit size and seed number.