6. Tax on packing material

  Where goods sold or purchased are contained in containers or are packed in any packing material liable to tax under the Act, the rate of tax applicable to such containers or packing material shall, whether the price of the containers or packing material is charged for separately or not, be the same as the rate of tax applicable to such goods so contained or packed, and where such goods sold or purchased are exempt from tax under the Act, the containers or packing material shall also be exempted.