Tebtunis Mummy Portrait Study (video) Northwestern University Share Print E-Mail Loading video... Caption Northwestern University researchers use scientific tools to study the materials and methods used by Roman-Egyptian artists to paint mummy portraits more than 2,000 years ago. Clues about the paintings' underlying surface shapes and colors provide very strong evidence as to how many of the portraits and panel paintings were made. Credit Marc Walton, Northwestern University Usage Restrictions Credit must be given 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.