Tariff amendment standardises ad valorem rate and removes provisos affecting central excise exemptions under Chapter 86. The Government, under section 5A of the Central Excises and Salt Act, 1944, amends Notification No. 452/86-C.E. by substituting the concluding words, omitting the first and second provisos, and replacing the entry in column (4) of the annexed Table for all serial numbers with '10% ad valorem'.