Between 1980 and 1982 , the French expedition found 3,000,000 crushed snail shells and Kassite potsherds on the islands .
The Kassites operated a purple dye industry on Al Khor Island from c. 1400 to 1100 BC .
Between 1980 and 1982 , the French expedition found 3,000,000 crushed snail shells and Kassites potsherds on the islands .
The Kassites operated a purple dye industry on Al Khor Island from c. 1400 to 1100 BC .