Kautilya's Arthashastra 4.7.8

4.7.8

śyāvapāṇipādadantanakhaṃ śithilamāṃsaromacarmāṇaṃ phenopadigdhamukhaṃ viṣahataṃ vidyāt //

Any dead person with dark coloured hands, legs, teeth, and nails, with loose skin, hairs fallen, flesh reduced, and with face bedaubed with foam and saliva, may be regarded as having been poisoned.