Excise exemption for gold potassium cyanide solution used in-house for jari manufacture relieves it from the specified duty. Exemption for gold potassium cyanide solution classified under Chapter 28 where produced in a factory and used within that factory for manufacture of jari, relieving that factory-produced input from the whole of the duty of excise specified in the Central Excise Tariff schedule under the Central Excises and Salt Act powers.