§ 172. Provisions governing sale and distribution. No person shall
hereafter sell, barter, or exchange, or receive, hold, pack, display, or
offer for sale, barter, or exchange, any dangerous caustic or corrosive
substance in a misbranded parcel, package, or container, said parcel,
package, or container being designed for household use; provided, that
household products for cleaning and washing purposes, subject to this
act and labeled in accordance therewith, may be sold, offered for sale,
held for sale and distributed by any dealer, wholesale or retail;
provided, further, that no person shall be liable to prosecution and
conviction under this article when he establishes a guaranty bearing the
signature and address of a vendor residing in the United States from
whom he purchased the dangerous caustic or corrosive substance, to the
effect that such substance is not misbranded within the meaning of this
article. No person shall give any such guaranty when such dangerous
caustic or corrosive substance is in fact misbranded within the meaning
of this article.