硫酸铝

• 酉(wine vessel; ferment)RADICAL
• 夋(slow manner; leisurely pace)PHONETIC

Fermenting alcohol produces sourness, which is exactly the character for sour.

• 釒(metal)RADICAL
• 吕(tone law; surname Lü)PHONETIC

The metal aluminum carries the radical for metal and the sound reading from the character Lü.