When the flame and the smoke turn blue and crackle, and when birds (that eat the oblation) die, presence of poison (in the dish) shall be inferred. When the vapour arising from cooked rice possesses the colour of the neck of a peacock, and appears chill as if suddenly cooled, when vegetables possess an unnatural colour, and are watery and hardened, and appear to have suddenly turned dry, being possessed of broken layers of blackish foam, and being devoid of smell, touch and taste natural to them; when utensils reflect light either more or less than usual, and are covered with a layer of foam at their edges; when any liquid preparation possesses streaks on its surface; when milk bears a bluish streak in the centre of its surface; when liquor and water possess reddish streaks; when curd is marked with black and dark streaks, and honey with white streaks; when watery things appear parched as if overcooked and look blue and swollen; when dry things have shrinked and changed in their colour; when hard things appear soft, and soft things hard; when minute animalculæ die in the vicinity of the dishes; when carpets and curtains possess blackish circular spots, with their threads and hair fallen off; when metallic vessels set with gems appear tarnished as though by roasting, and have lost their polish, colour, shine, and softness of touch, presence of poison shall be inferred.