SECTION 1. Section one hundred eighty-seven of Commonwealth net Numbered Four hundred and sixty-six is amended to read as follows;
"SEC. 187. Percentage tax on consignments abroad. -Every merchant or producer not herein specifically exempted, shall pay a tax of one and one-half per centum of the gross value "money of-the commodities, goods, wares, and merchandise consigned abroad by him, such tax to be based on the actual selling price or value of the things in question at the time they are consigned abroad, whether consisting of raw materials or of manufactured or partially manufactured products or whether of domestic or foreign origin: Provided, That the tax prescribed in this section shall not he imposed on (a) articles upon which the tax prescribed in sections 184, 185, 186, and 189 has previously been paid; (b) articles imported into the Philippines and re-exported from the same in their original condition by the importer; and (c) minerals and mineral products when consigned abroad by the lessee, concessionaire, or owner of the mineral land from which removed. The tax upon things consigned abroad shall be re Junded upon satisfactory proof of the return thereof to the Philippines unsold, subject to the limitation established in section 309 of this Code."