Optimal Surface Color
The application of the survival statistics concept to the results
of the sensory test allowed finding the Rl and Rd rejection
functions; hence, Weibull distribution, detailed in Eqs. (3a)
and (3b), being the most appropriate to adjust them. The
values of the parameters ì and ó are 4.541±0.040 and
0.124±0.029 for Rl and 4.806±0.012 and 0.034±0.009 for
Rd, respectively. Fig. 4 shows both rejection curves, it also shows the global
curve resulting from Rl and Rd addition. Thus, the optimal
value searched for corresponds to the minimum of the latter
curve, resulting in a BI value equal to 108±2 associated with a
6.72 % rejection percent (only three consumers out of 50
surveyed rejected this product for being too light or too dark).