When the TTI was activated
at pH values between 5.0 and 7.0, it did not exhibit a very
strong staining, ranging from lilac to a bright green tone, which
explains the high values of the L* (>99) parameter, which indicates
transparency, and the fact that anthocyanin presents a more
intense red colour when the pH is below 5.0, which can be seen in
Fig. 6