Rasaratnasamuccaya 2.9

śvetaṃ raktaṃ ca pītaṃ ca kṛṣṇamevaṃ caturvidham /
śvetaṃ śvetakriyāsūktaṃ raktābhaṃ raktakarmaṇi /
pītābhamabhrakaṃ yattu śreṣṭhaṃ tatpītakarmaṇi //

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