Extension of anti-dumping duty on caustic soda preserves import restrictions for specified origins for an additional statutory period. Extension of anti-dumping duty on imports of Caustic Soda from specified origins is effected by amendment to the original customs notification; the Central Government, under powers conferred by the Customs Tariff Act and following a review by the designated authority, has added an express proviso that the earlier notification imposing the anti-dumping measure remains in force for an additional period unless revoked earlier.