Calculation of Yellowness Index and Whiteness Index Using Instrumental Color Coordinates
Meaning and use 5.1 This practice should only be used to compare samples of the same material and the same general appearance. For example, a range of specimens to be compared should have roughly similar lustre, texture and (if not opaque) thickness and semi-transparency. 5.2 For yellowness measurements, this practice is limited to samples whose main wavelength is in the range 570 to 580nm or whose Munsell hue is approximately 2.5GY to 2.5Y. For whiteness measurements, this practice is limited to [...]