[en] A measurement technique for identifying lee-side crossflow-induced boundary-layer separation on a blunt $7^{\circ <!--\; ???\; -->}$ half-angle circular cone at high angle of attack has been developed and tested. Previous work has shown that local minima in root-mean-squared (rms) pressure fluctuations on the surface are good identifiers of separation. These surface pressure fluctuations are measured with a temperature-corrected, high-frequency-response anodized-aluminum pressure-sensitive paint (AA-PSP). This AA-PSP was made in-house to provide the high frequency response required for this work. The sensor’s frequency response of 3 kHz proved to be fast enough to detect lines of local minimum rms pressure fluctuations indicative of separation on the lee side of the cone for angles of attack from ${9.8}^{\circ <!--\; ???\; -->}$ to ${15.8}^{\circ <!--\; ???\; -->}$. A shift in the separation location towards the windward side of the model was observed as angle of attack increased; however, the separation location converged to a constant azimuth for angles of attack greater than or equal to $1.8\times <!--\; ??\; -->$ the cone’s half angle.