Acid bottles on shelves. On the top shelf are diluted nitric, hydrochloric, sulphuric and ethanoic acids. On the bottom shelf are concentrated hydrochloric, sulphuric and nitric acids. The cross symbols on some of the bottles warn that the content is an irritant. The symbols depicting two test tubes pouring liquid on to a surface and a hand indicate that the content is corrosive. In addition, nitric acid is labelled with a flame symbol warning that it is an oxidant.