The dissolution trajectory of a 1:1 cocrystal may also be inferred from the ternary diagram. If acetone is added to a sample of cocrystal, a solution phase of the same caffeine/maleic acid stoichiometry will initially be obtained. However, with increased addition of acetone the tie line joining the 1:1 solid composition to the 100% acetone apex rapidly enters region 3 so that a phase change must occur giving a solution phase of composition E1 in equilibrium with a mixture of solid caffeine and 1:1 cocrystal. On further solvent addition, the system will enter region 2 giving a solution in equilibrium with solid caffeine. Given the asymmetry of the solubilities of the coformers, this behavior will be mirrored in all pure solvents.