2.1.1. For the purposes of section 13.1 of the Act, where a package referred to, as the case may be, in subparagraph a of the first paragraph of section 2 or in the subparagraph a of the first paragraph of section 2.1, is offered for sale to a consumer in another container where the identification mark affixed on the package is not visible, the person who is required, under this Regulation, to affix an identification mark on the package, shall affix the identification mark provided for in subparagraph b of the first paragraph of section 2 so that the identification mark is clearly visible on one side of that other container.