For this work, we are interested in measuring the phase stability, turbidity, and rheology of the prepared formulations, however, only the stable formulations are characterised for their turbidity and rheology, as these measurements are not meaningful for inhomogeneous mixtures . This is summarised in Figure which shows that a set of experiments are executed according to the DoE. These formulations are then assessed for their phase stability, with the stable samples being titrated to an industrially specified pH target .