Marketability of intermediate odoriferous compounds determines excisability; marketable mixes are subject to excise duty. Excisability of odoriferous compounds used in agarbathi depends on marketability: non-marketable secret intermediate mixes remain non-excisable, but where evidence shows an intermediate compound is capable of being bought and sold as a distinct commodity (e.g., has shelf life and identifiable characteristics), it is excisable irrespective of whether it is actually marketed.