History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c14.s1.18

v1.c14.s1.18

Again faulty casting could allow formation of air bubbles in the metal, resulting in the fragility of the coins concerned. Moreover, mould-impressions were not always properly transferred (with all their details and sharpness) to coins since such a transfer was not mechanically or manually controlled.⁷