Qin Yu realized he had underestimated the art of alchemy.

Watching Jiao Xiaoxiao's demonstration seemed so effortless, but when Qin Yu tried it himself, he discovered the difficulty was far greater than he had imagined.

In this world, there were no measuring tools; achieving the right temperature relied solely on experience and intuition.

Qin Yu guessed that even the 500 degrees mentioned in the alchemy recipe was merely an alchemist's rough estimate.