Alchemy

Alchemy was practiced by someone whose occupation was called an alchemist, such as the 16th century alchemist named Paracelsus.

An alchemist basically was able to transform a metal into another type of metal. For example, Hank and Ben used their quark rectifier to transform ordinary quarks into whatever metals they desired.

Firestorm's super powers allowed him to manipulate matter in such a way that he could even transmute materials into whatever he chose. He even changed fire into snow on at least one occasion. His powers were limited though, as he couldn't change any form of organic matter.