Sushruta Samhita
अम्लवर्जान् रसान् क्षारे सर्वानेव विभावयेत् । कटुकस्तत्र भूयिष्ठो लवणोऽनुरसस्तथा । अम्लेन सह संयुक्तः स तीक्ष्णलवणो रसे ॥२४॥
In alkali, consider all flavors to be sour, with bitterness as the most prominent, followed by salt and other secondary flavors. When combined with sourness, it becomes a sharp, salty taste.
english translation
amlavarjAn rasAn kSAre sarvAneva vibhAvayet । kaTukastatra bhUyiSTho lavaNo'nurasastathA । amlena saha saMyuktaH sa tIkSNalavaNo rase ॥24॥
hk transliteration by Sanscript