Plot of the Contact Angle (IMAGE) Tokyo University of Science Caption Plot of the contact angle along the parallel (y) and perpendicular (x) directions versus number of uses of the mold. The mold becomes defective when the contact angle along the vertical direction becomes equal to the stable minimum value along the perpendicular direction. Credit Jun Taniguchi, Tokyo University of Science Usage Restrictions None License Licensed content 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.