Santiago learns that one of the most important texts in the literature of alchemy contains only a few lines and is inscribed on something called the emerald tablet .
it refers to a writer's deliberate use of alchemical subject matter , terminology and process as a useful organizing principle for his or her text, especially when writing about individuals undergoing trials and changes as they mature .
there are three types of alchemy : sulfur , mercury , salt .
Emerald tablet :
it is also known as the Smaragdine tablet .
it is highly regarded by Islamic and European alchemists as the foundation of their art .
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