Sec. 151.153.  RESALE CERTIFICATE:  COMMINGLED FUNGIBLE GOODS.  If a purchaser gives a resale certificate with respect to the purchase of fungible goods and then commingles the goods with other similar fungible goods for which a resale certificate was not given, sales from the mass of commingled fungible goods are deemed to be sales of goods covered by the resale certificate until the quantity of goods covered by the certificate equals the quantity of goods sold.
Acts 1981, 67th Leg., p. 1554, ch. 389, Sec. 1, eff. Jan. 1, 1982.