Spectacles on the bridge of the nose, eyes crinkling whenever that malleable fine wire twists recalcitrant, 50-something Bhanu Das deftly crochets a loop, her fingers flying as she weaves a metallic string. Her husband, Jatindra Nath Das, the 65+ owner of a narrow, long and rectangular Barpetia jewellery-making workshop, mixes tiny pieces of silver with pounded wood-coal and fires it in a mud stove. Once the embers go cold, the ash will be blown away leaving behind wee balls. Four men on the...