Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
Ordo Aurum Solis of the Aurum Solis". Jean-Louis de Biasi, an author and philosopher born in Southern France, has been involved in the Mystery Traditions for the past forty years. He has been Grand Master of Ordo Aurum Solis since 2003, as shown on the Order Aurum Solis' website. De Biasi has written books on the Ogdoadic Tradition, the Tarot, the aura, and Freemasonry. As per his website, he now seems to be actively writing books in English. He wrote "Secrets and Practices of the Freemasons: Sacred Mysteries, Rituals and Symbols Revealed" and has written two books directly related to Ordo Aurum Solis: