Exemption for jute yarn now conditioned on compliance with Chapter X procedures when used outside manufacturing factory. The amendment omits the word 'captively' from the opening paragraph of Notification No. 51/90-C.E. and inserts a proviso that, where use is in a factory other than the factory of manufacture, the exemption for jute yarn is available only if the procedure laid down in Chapter X of the Central Excise Rules, 1944 is followed.