The Compendium of Caraka 1.24.20

1.24.20

aruṇābhaṃ bhavedvātādviśadaṃ phenilaṃ tanu/
pittāt pītāsitaṃ raktaṃ styāyatyauṣṇyāccireṇa ca//

From vāta, it is reddish, clear, frothy, and thin; / from pitta, blood is yellowish-black, and on account of heat coagulates slowly;