§ 171. Definitions. 1. The term "dangerous caustic or corrosive substance" means each and all of the acids, alkalis, and substances named below: (a) hydrochloric acid and any preparation containing free or chemically unneutralized hydrochloric acid (HCI) in a concentration of ten per centum or more; (b) sulphuric acid and any preparation containing free or chemically unneutralized sulphuric acid (H2SO4) in a concentration of ten per centum or more; (c) nitric acid or any preparation containing free or chemically unneutralized nitric acid (HNO3) in a concentration of five per centum or more; (d) carbolic acid (C6H5OH), otherwise known as phenol, and any preparation containing carbolic acid in a concentration of five per centum or more; (e) oxalic acid and any preparation containing free or chemically unneutralized oxalic acid (H2C2O4) in a concentration of ten per centum or more; (f) any sale of oxalic acid other than cerium oxolate and any preparation containing any such salt in a concentration of ten per centum or more; (g) acetic acid or any preparation containing free or chemically unneutralized acetic acid (HC2H302) in a concentration of twenty per centum or more; (h) hypochlorus acid, either free or combined, and any preparation containing the same in a concentration so as to yield ten per centum or more by weight of available chlorine, excluding calx chlorinate, bleaching powder, and chloride of lime; (i) potassium hydroxide and any preparation containing free or chemically unneutralized potassium hydroxide (KOH), including caustic potash and Vienna paste, in a concentration of ten per centum or more; (j) sodium hydroxide and any preparation containing free or chemically unneutralized sodium hydroxide (NaOH), including caustic soda and lye, in a concentration of ten per centum or more; (k) silver nitrate, sometimes known as lunar caustic, and any preparation containing silver nitrate (AgNO3) in a concentration of five per centum or more, and (l) ammonia water and any preparation yielding free or chemically uncombined ammonia (NH3), including ammonium hydroxide and "hartshorn," in a concentration of five per centum or more.

2. The term "misbranded parcel, package, or container" means a retail parcel, package, or container of any dangerous caustic or corrosive substance for household use, not bearing a conspicuous, easily legible label or sticker, containing (a) the name of the article; (b) the name and place of business of the manufacturer, packer, seller, or distributor; (c) the word "POISON," running parallel with the main body of reading matter on said label or sticker, on a clear, plain background of a distinctly contrasting color, in uncondensed gothic capital letters, the letters to be not less than twenty-four point size, unless there is on said label or sticker no other type so large, in which event the type shall be not smaller than the largest type on the label or sticker, and (d) directions for treatment in case of accidental personal injury by the dangerous caustic or corrosive substance: Provided, that such directions need not appear on labels or stickers on parcels, packages, or containers at the time of shipment or of delivery for shipment by manufacturers or wholesalers for other than household use.