I've had an ongoing issue measuring ph with a clay mask formulation. I understand that solids are going to pose a challenge, but did assume my readings would be consistent and somewhat accurate (not fluctuate so much during readings). The product contains Honey, Water (10%), Fuller's Earth, Glycolic, Citric, Tartaric and Lactic acids, Glyceryl Caprylate, Glycerin, Sodium Levulinate, Sodium Anisate. The ph meter has been calibrated, and even when diluted my readings are fickle. We are shooting for a ph of 3.8-4.
Any suggestions or insights would be most appreciated.