Rasaratnasamuccaya 31.18

caturddhā varṇabhedena viṣaṃ jñeyaṃ manīṣibhiḥ /
brahmakṣattriyaviṭśūdrāḥ śvetaraktāśca pītakāḥ //
kṛṣṇavarṇaḥ kramājjñeyo varṇānāmanupūrvaśaḥ //

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