Ruderman et al published an important paper, where they demonstrated via UV absorption spectroscopy and molecular dynamics simulation that acetic acids form dimer, trimer and higher order aggregates by forming H-bonds with each other and/or with water. The signature of the extended H-bond formation was evident in UV spectroscopy that exhibited progressive Bathochromic (red) shift with the concurrent increase of the aggregate size that occur when the concentration of the acetic acid is increased. This knowledge has been very crucial in interpreting the Bathochromic or Hypsochromic behaviors of surfactants, notably when carboxylic acid is a functional group of the surfactant.