Vikings and Polarization
We previously wrote about the Mantis shrimp’s use of birefringence as a means of hunting for transparent aquatic prey. Vikings are alleged to have used birefringence as well, but for navigational purposes. A calcite crystal found in a British warship that sank in 1592 was included amongst other navigational tools in the wreck. The crystal […]
New ASTM F2459-18 Standard Test Method for Extracting Residue
ASTM F2459 Standard Test Method for Extracting Residue from Metallic Medical Components and Quantifying via Gravimetric Analysis The latest draft of ASTM F2459 Standard Test Method for Extracting Residue from Metallic Medical Components and Quantifying via Gravimetric Analysis just published. The key difference in this version is the inclusion of the method to determine extractable […]