New What Are The Properties Of Acids And Bases Pictures. Have you ever had acid indigestion? Acids are chemical substances which are characterized by a sour taste in an aqueous medium.
And they turn red litmus paper blue (the opposite of acids).
All acids and some alkalies show corrosive action on skin as they form. Turns red litmus paper to a blue colour. Bases are substances which will restore the original blue color of litmus after having been reddened by an acid. The same hazard symbol that is used to warn people of the dangers of acids.