The Compendium of Caraka 2.4.25

2.4.25

teṣāmapi tu khalu pittaguṇaviśeṣeṇaiva nāmaviśeṣā bhavanti; tadyathā---kṣāramehaśca, kālamehaśca, nīlamehaśca, lohitamehaśca, māñjiṣṭhamehaśca, hāridramehaśceti//

Their distinct names also arise entirely from the particular qualities of pitta; namely: kṣārameha, kālameha, nīlameha, lohitameha, māñjiṣṭhameha, and hāridrameha.