AbstractThermal Theological analysis (TRA) is employed as an analytical method to quantitatively assess temporal viscosity changes in triethanolamine-stearate stabilized mineral oil/water systems. Continuous measurement of stress required to maintain a constant rate of shear was monitored while temperature was raised from 25 to 75°C. The rheological profiles obtained were distinquished by distinct, unexpected, reproducible discontinuities which were formulation dependent and changed with time and temperature. These changes have been attributed to as yet unverified shifts in individual and aggregate liquid crystalline structures. Quantitative analysis studies currently underway will aid in determining the usefulness of thermal Theological data as a predictive tool of long term emulsion stability.