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 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.