" After it is substituted in 1990 with retrospective effect from 1.4.1986, this Section reads thus "Where a dealer who being liable to pay tax under this Act purchases either directly or through a commission agent any taxable goods (not being declared goods) and uses them as raw or processing materials or consumable stores, in the manufacture of taxable goods, then there shall he levied in addition to any tax levied under the other provisions of this Act, a purchase tax at the rate of (a) two paise in a rupee on the turnover of such purchases made during the period commencing on the 1st April, 1986 and ending on the 5th August, 1988; and (b) four paise in rupee on the turnover of such purchases made at any time after the 5th August, 1988, provided that where the raw materials purchased for use in the manufacture of goods are bullion or specie, the rate of purchase tax on the turnover of purchases of such raw materials shall not exceed the aggregate of the rates of sales tax and general sales tax leviable on bullion or specie under Entry I in Schedule III.