ruby crystals in box for electron spin resonance experiments
Date: mid 20th-late 20th Century
Inventory Number: 2004-1-0415a
Classification: Nuclear Magnetic Resonance
Dimensions:box: 2.2 x 5.4 x 5.4 cm (7/8 x 2 1/8 x 2 1/8 in.)
Description:
Four small crystals in a box. The smallest is yellowish in color, but the three larger crystals are clear: this indicates that the rubies have been baked at a high temperature in order to drive out the chromium impurities that give rubies their usual color.