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Colour measurements
The colour properties of the pigments were measured. A Hunter lab D25-2 colour/difference meter was used to measure and specify the colours of the samples prepared in comparison with the Bayer¡¯s standard samples, based on the widely used ¡°Commission Internationale de l¡¯Eclairage¡± (CIE) system. The chromaticity co-ordinates x¡ä, y¡ä,and z¡ä£¬ for the coloured samples were calculated as follows:

x¡ä=X/£¨X+Y+Z£©,y¡ä=Y/(X+Y+Z),z¡ä=Z/(X+Y+Z)

where x¡ä, y¡ä and z¡ä denote chromaticity co-ordinates in the CIE. diagram, and X, Y, Z are the readings taken from the equipment representing the co-ordinates.The values of x¡ä,y¡ä and z¡ä corresponding to the colour of any surface are independent of the reflection characteristic and the spectral distribution of the light that falls upon it.

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