2.6. Measurement of instrumental colour
Colour of the samples was measured by a Hunter-Lab colour meter (Hunter Lab DP-9000 colour difference meter, Hunter Associates Laboratory, Virginia, USA) fitted with a 2.5 cm diameter aperture using the method as described by Rawson et al. (2011). In addition, total colour difference (TCD) was calculated using the following equations, where L0, a0, b0 are the control (fresh untreated sample) values for carrots.
equation(1)
TCD=[(L∗-L0)2+(a∗-a0)2+(b∗-b0)2]1/2
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