One of the most well known books on alchemy, The Twelve Keys of Basil Valentine, &nbsp;is a allegorically encrypted set of instructions on how to create the philosopher&#39;s stone, a legendary substance that can turn base metals into gold. Some say the philosopher&#39;s stone is actually a reference to the recipe for immortality.&nbsp;<br /><br />The magical substance or how to create it has been searched for by such great minds as Sir Isaac Newton and has inspired popular culture for years.&nbsp;