instruction: Provide an example of using modern materials science to study archaeological artifacts
context: Ursula Martius Franklin was a German-Canadian metallurgist, research physicist, author, and educator who taught at the University of Toronto for more than 40 years. Franklin was a pioneer in the field of archaeometry, which applies modern materials analysis to archaeology. She worked for example, on the dating of prehistoric bronze, copper and ceramic artifacts. One small example of her work in this field regards what was a standing question on the nature of shiny black Chinese mirrors found in high quantities in ancient tombs. Franklin's use of microscopic etching, electron microprobe and x-ray fluorescence analyses produced evidence that what was thought by some to be a corrosive effect was in fact present in these ancient mirrors (and weapons) at their inception, in dark iron oxides intentionally added near the objects' surfaces. Franklin additionally pulled from historic and literary accounts of black mirrors in Chinese literature to support these findings. Franklin's expertise was also instrumental to dating glass; she guided a study on the remains of blue glass beads in North America remaining from early trade relationships between American Indian tribes and Europe
response: Archaeometry employs modern technology (such as x-ray fluorescence) to study the origins and environments of historical artifacts. Ursula Franklin was well known in this field; she found evidence of global trade in the remains of glass beads and proved that black mirrors present in large quantities in ancient Chinese tombs were purposely crafted, and not the result of corrosion.