Lower organic peracid refers to the peracid of an organic aliphatic monocarboxylic acid having 2 to 10 carbon atoms (i. e., R is an organic radical having from 1 to 9 carbon atoms), such as acetic acid (ethanoic acid), propionic acid (propanoic acid), butyric acid (butanoic acid), iso-butyric acid (2-methyl-propanoic acid), valeric acid (pentanoic acid), 2-methyl-butanoic acid, iso-valeric acid (3