In this regard, the formation of larger regions filled with water was observed, which can be interpreted as a local phase separation between SOM and water, particularly evident for SOM II at the highest water content. The phase separation process is depicted quantitatively in Figure . It shows the overlap between the normalized partial densities of the HS molecules and water as a function of the simulation time of the production part of the trajectory. For additional information on the overlap calculation, please refer to Section S7 in the Supporting Information. In addition, Figure presents two snapshots of the trajectory of the aforementioned system, one at the beginning of the production run (a) and one at the end (b). Figure shows that the overlap is decreasing exponentially, approaching a value of around 0.721. This indicates that the initially more mixed structure, with a greater overlap between partial densities, gradually becomes less mixed, resulting in a lower overlap. The strength of the demixing can be further quantified using the parameters of the exponential fits. These can be found in Table of the Supporting Information. For the other SOM systems at the highest water concentration, the overlap is exclusively less than one but higher than for SOM II. A certain amount of demixing is to be expected, as the structures formed by the HS molecules will not result in an ideal mixture.