History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c38.s2.t1.9

The *kṛṣṇala* (*Guñja, Ratikā*), the black-and-red berry of the shrub (*Abrus Precatorius*) was used as a natural measure (Seal, pp.80- 85).