They suggest that iron arsenide was deliberately produced as part of the copper smelting process, to be traded and used to make arsenical bronze elsewhere by addition to molten copper.
A number of companies may have been responsible for waste oil discharges and arsenical pesticides released to a nearby stream as industrial operations date back to 1912.
There are no real advantages metallurgically for the superiority of tin bronze, and early authors suggested that arsenical bronze was phased out due to its health effects.
