The term refers to the general usage of "perk" as an abbreviation of "perquisite". He reputedly received a gift, probably a diplomatic perquisite, of tea flavoured with bergamot oil. Pete Philly and Perquisite released in early 2005. This "varenne" of the King was a perquisite (privilege) of the Crown. The workers knew the importance of the perquisite system. The song was written by Macrooy, with all instruments and arrangements by Perquisite & Macrooy. The other application of thorium(IV) chloride is a perquisite for other thorium complexes.