The Compendium of Caraka 1.26.55

1.26.55

madhyotkṛṣṭāvarāḥ śaityāt kaṣāyasvādutiktakāḥ /
svadurgurutvādadhikaḥ kaṣāyāllavaṇo 'avaraḥ //

In terms of coldness, astringent, sweet, and bitter are intermediate, foremost, and inferior; / sweet is greater than astringent in heaviness, and salty is inferior [to it];