Sulfuric acid the Hellenistic alchemical works of Zosimos of Panopolis, in the treatise "Phisica et Mystica", and the Leyden papyrus X. Medieval Islamic era alchemists, Jābir ibn Hayyān (c. 721 – c. 815 AD, also known as Geber), Razi (865 – 925 AD), and Jamal Din al-Watwat (d. 1318, wrote the book "Mabāhij al-fikar wa-manāhij al-'ibar"), included vitriol in their mineral classification lists. Ibn Sina focused on its medical uses and different varieties of vitriol. Sulfuric acid was called "oil of vitriol" by medieval European alchemists because it was prepared by roasting "green vitriol" (iron(II) sulfate) in an iron retort. There are
What Is Life early June. The same core of musicians – Bobby Whitlock, Carl Radle, Jim Gordon, Bobby Keys and Jim Price – would similarly elevate other "All Things Must Pass" tracks such as "Awaiting on You All", "Art of Dying" and "Hear Me Lord". The recording is defined by Harrison's descending, fuzztone guitar riff, which also serves as the motif for the chorus.<ref name="Unterberger/AM">Richie Unterberger, "George Harrison 'What Is Life'", AllMusic (retrieved 22 February 2012).</ref> The track opens with this riff, which is then joined by Radle's bass and "churning" rhythm guitar from Clapton, before Gordon's drums bring the full band in.