Vaisesika Sūtra 2.2.01

पुष्पवस्त्रयोः सति सन्निकर्षे गुणान्तराप्रादुर्भावो वसत्र गन्धाभावलिङ्गम् ॥१॥

puṣpavastrayoḥ sati sannikarṣe guṇāntarāprādurbhāvo vasatra gandhābhāvaliṅgam ॥1॥

[पुष्प (puṣpa) - flower; वस्त्र (vastra) - cloth, garment; योः (yoḥ) - of the two; सति (sati) - existing, being present; सन्निकर्षे (sannikarṣe) - in contact, proximity; गुणान्तर (guṇāntara) - different qualities; अप्रादुर्भावः (aprādurbhāvaḥ) - disappearence of; वस्त्र (vastra) - garment; गन्ध (gandha) - fragrance; अभाव (abhāva) - absence; लिङ्गम् (liṅgam) - indication;]

When the flower and garment that are together are brought to proximity, the disappearance of fragrance from the garment is the distinguishing mark.

Nature of distinguishing mark is being explained.