Taguchi LAHB Fracture (IMAGE) Kobe University Caption A fractured stick of lactic acid with added ultra-high molecular weight LAHB (left) exhibits obvious white discolorations at the fracture face, which is a sign of plastic deformation in toughened materials. On the other hand, pure polylactic acid (right) does not show such whitening, which is a sign of brittle materials. Credit KOH Sangho Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.