History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c12.34

c12.34

The pottery articles of the Indus Valley are found to be all well-baked. The resulting fabric was hard enough to withstand considerable knocking about. The uniformity of the colour indicates that the potter had sufficient control over the heat of his furnace. Even in the case of larger storage jars often as much as 1·02 inches thick, this uniformity of colour was maintained right through. Very few over-heated vessels were noticed by Mackay among the findings, the number of under-fired ones was also rather small. Some few over-fired specimens have a greenish tinge due to the presence of ferrous compounds, in whose formation time plays an important part.