High Quality Content by WIKIPEDIA articles! Purity of Essence is Australian rock group Hoodoo Gurus` ninth studio album. It was recorded six years after their last studio album, Mach Schau, and was released on 12 March 2010. The album peaked at No. 16 on the Australian Recording Industry Association (ARIA) Albums Chart. It was released internationally on 11 May on the band`s own label via Virtual Label/ADA.