As already described, there are twelve different kinds of rasas, or ecstatic relationships which are shared with Kṛṣṇa. Five of these rasas are direct, and they are listed as neutrality, servitude, fraternal love, parental love, and conjugal love. Seven of the rasas are indirect, and they are listed as humor, astonishment, chivalry, compassion, anger, dread and ghastliness. The five direct rasas are eternally manifested in the Vaikuṇṭha world, the spiritual kingdom, whereas the seven indirect rasas are eternally manifesting and unmanifesting in Gokula Vṛndāvana, where Kṛṣṇa displays His transcendental pastimes in the material world.
Very often, in addition to one's regular rasa, there is found the presence of some other rasa, and the mixture of these loving humors is sometimes compatible, or palatable, and sometimes incompatible, or unpalatable. The following is a scientific analysis of the compatibility and incompatibility of the mixtures of these various rasas, or loving moods.
When in the rasa of neutral love (śānta-rasa) there are found traces of dread or astonishment, the result is compatible. When with this neutral love there are manifestations of conjugal love, chivalry, anger or dread, the result is incompatible.
When in the ecstasy of a serving humor, there are manifestations of dread, neutral love, or chivalry (such as dharma-vīra and dāna-vīra) the result is compatible. The ecstasy of devotional service in chivalry (yuddha-vīra) and anger are directly produced by Kṛṣṇa Himself.
With the ecstasy of fraternal love, a mixture of conjugal love, laughter or chivalry is highly compatible. With the same fraternal love, a mixture of dread or parental love is most incompatible.