Ashtangasamgraha 36.13

36.13

ekaprahārābhihatā dhārayā yā sravedasṛk |

muhūrtaruddhā tiṣṭhecca samyagviddheti tāṃ viduḥ ||

rājikāvarṇasaṃsthānapramāṇā rājikāhvayāḥ ||

That [vein] which, struck with a single blow, discharges blood in a stream, / and when held for a moment stops, they know as properly punctured. / Those having the color, shape, and size of mustard seeds are named rājikā.