Charak Samhita
पाने नीला राजी वैवर्ण्यं स्वां च नेक्षते छायाम् । पश्यति विकृतामथवा लवणाक्ते फेनमाला स्यात् ॥१११॥
If the poison is added to drinks like water, milk or alcohol, blue lines appear over its surface or it becomes discolored. A person’s own shadow is not reflected through such drinks or the shadow is reflected in a distorted manner. If such drinks are added with salt, then there is froth.
english translation
pAne nIlA rAjI vaivarNyaM svAM ca nekSate chAyAm । pazyati vikRtAmathavA lavaNAkte phenamAlA syAt ॥111॥
hk transliteration by Sanscript