Considering the data in Table 3, the parameter a* (green e red
axis) derived from the CIELab scale showed significant variations in
the range which comprises the colour red, and is characterized by
the values found for the activated TTI in lactic acid, with a
maximum value of 19.75 ± 0.01 in pH 1.0 to pH 4.0 (2.86 ± 0.02).