Colour variation on the CH-Sys was associated with changes in the chemical structure of ATH molecules. Thermal degradation can produce alteration in ATH structures that depends on the severity and heating conditions. The mechanisms of ATH degradation are still relatively unknown. Chemical structures and the presence of other organic acids have a strong influence (Patras et al., 2010). Markakis et al. (1957) suggested that the pyrylium ring of ATH opens, forming a chalcone structure as a first degradation step. Chalcone is derived from three acetates and one cinnamic acid.