Cement Sample (image) University of Copenhagen - Niels Bohr Institute Caption The cement powder is packaged in aluminum foil and placed in a sample holder. The sample holder is sealed tight with indium wire and 22 screw. Credit Johan Jacobsen, Niels Bohr Institute Usage Restrictions Johan Jacobsen, Niels Bohr Institute 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.