  The article describes the potential application of thermodynamic simulation
to forecast chemical aging and relevant color changes in painting. Qualitative
and numerical results were obtained by applying the method to various mixtures
of pigments without and with atmospheric components. The results were compared
to the legendary recommendations on incompatible pigment mixtures with about an
80 percent match regarding potential color changes in the aged mixtures.
Results for the cadmium yellow-lead white and cadmium lemon-emerald green
mixtures are illustrated by pictures, gradually showing color changes caused by
the aging. The method of thermodynamic simulation can be a powerful tool to
investigate old masterpieces, in developing new materials, and to forecast some
aspects of the aging of real masterpieces.
