Ahead of Diwali, six big firecracker manufacturers on Wednesday faced the ire of the Supreme Court, which asked them to explain why contempt of court proceedings be not initiated against them for using the banned chemical barium and its salts in producing crackers.Ahead of Diwali, six big firecracker manufacturers on Wednesday faced the ire of the Supreme Court, which asked them to explain why contempt of court proceedings be not initiated against them for using the banned chemical barium and its salts in producing crackers.