Vaisesika Sūtra 2.1.7

त्रपुसीसलोहरजतसुवर्णानामग्नि संयोगाद् द्रवत्वमद्भिः सामान्यम् ॥७॥

The tin, lead, iron, silver, and gold - by union with fire, liquid-ness is formed by generality, i.e. common property.