In order to develop a phase stability classifier for a weighted-space filling design, as introduced earlier, we needed to featurise our formulations in a machine-readable manner , ). Unfortunately, effectively featurising macromolecules, such as the polymeric and thickener ingredients, is an open question with many promising recent studies but no general solution to date. Mixtures of such molecules -i.e., formulations, are even more difficult to represent. Currently, the simplest approach is to directly take the concentrations of polymer and thickener added, and a one-hot encoding of the ingredients, as in our previous work . Since we are presently unable to find a chemically suitable featurisation for the polymer and thickener ingredients, and to reduce the dimensionality of the DoE problem, we split the design space into eight distinct sub-systems for each possible polymer, thickener combination: