https://www.taxtmi.com/caselaws?id=90739 Lean gas or off gas generated in the manufacture of carbon black is not excisable because it was found to be an unmarketable mixture of crude gases and had not reached the RG-1 stage. The carbon monoxide was incinerated as an anti-pollution measure before the remaining gases were released, and the departmental circular on lean gas, stating that such gas need not suffer excise duty, was binding on the revenue. en-us Sat, 21 Feb 1998 00:00:00 +0530 Tue, 11 Oct 2011 11:46:27 +0530 TaxTMI RSS Generator https://www.taxtmi.com/caselaws?id=90739 Lean gas or off gas generated in the manufacture of carbon black is not excisable because it was found to be an unmarketable mixture of crude gases and had not reached the RG-1 stage. The carbon monoxide was incinerated as an anti-pollution measure before the remaining gases were released, and the departmental circular on lean gas, stating that such gas need not suffer excise duty, was binding on the revenue. Case-Laws Central Excise Sat, 21 Feb 1998 00:00:00 +0530 https://www.taxtmi.com/caselaws?id=90739