Turning Lead into GoldGold, in its natural state, is a scarce and valuable metal. Let’s first discuss the philosopher’s stone, a hypothetical alchemical substance with references dating back to 300 AD. Of course, no one has ever discovered the philosopher’s stone, but some have still sought ways to turn lead into gold. Thus, turning lead into gold would require transforming each lead atom into gold atoms. Here is the Kézako episode discussing the possibility of turning lead into gold: