1. On absorber, formed by two sheets of similar plantar configuration, one anterior and one posterior, each of said sheets of different materials, the posterior sheet being a porous and opaque sheet of a fibrous material, and the anterior sheet being a transparent laminar plastic material, said anterior and posterior sheets being joined together by welding along their edges so that the union of both sheets delimits a space inside the envelope in which gas absorbing elements are comprised, the graphic prints of the envelope being arranged on its front sheet or on its back sheet, characterized in that said front sheet is formed by a single layer of transparent polyethylene and because said ethylene absorbing elements comprise an ethylene absorbing granulate.
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