Scratching with Stainless Tweezers, Screwdriver and Diamond Pen (video) Harvard John A. Paulson School of Engineering and Applied Sciences Share Print E-Mail Loading video... Caption Surface coating scratched with stainless tweezers, screw driver and diamond pen. The coating, made from rough nanoporous tungsten oxide, is capable of repelling any kind of liquid even after sustaining intense structural abuse. Credit Aizenberg Lab/Harvard SEAS Usage Restrictions with credit Share Print E-Mail 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.