Old Science of Trying to Turn Base Metal Into Gold
Puzzle 2 of Stay Cool Piece of Cake Pack
Question is: Old Science of Trying to Turn Base Metal Into Gold
and the answer is: ALCHEMY
Word Meaning:
ALCHEMY — (uncountable) The premodern and early modern study of physical changes, particularly in Europe, Arabia, and China; and chiefly in pursuit of an elixir of immortality, a universal panacea, and/or a philosopher's stone able to transmute base metals into gold, eventually developing into chemistry.
Definitions from Wiktionary.