How are the centres of craft production identified? Described briefly.

Explanation

Historians look the following to identify the centres of craft.
(a) Raw materials: copper, stone, shells and tools.
(b) Rejects and waste materials.
(c ) Wastes are considered the good indicator for the production of crafts as shells or stones are cut to make new objects, so little piecesof such materials are the evidences.
(d) Past enabled the historians to reflect that apart small specialised empires-Lothal, Balakot, production was also in large cities: Mohenjodaro and Harappa.