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Same lab, same spectrometer, same reference collection, same services, new director.
THE X-RAYS ARE ON AND THE LAB IS OPEN: Craig has retired and the lab is open under a new laboratory director and owner, Alex Nyers.A NEW IAOS PUBLICATION: A new obsidian-related volume, Twenty Five Years on the Cutting Edge of Obsidian Studies, has recently been published by the International Association for Obsidian Studies (IAOS).To have a look at a sample or to buy a copy online through Pay Pal, click HERE.In order to transform the hydration rim value to a calendar age, the rate of the diffusion of water into the glass must be determined or estimated. The hydration rate is typically established empirically through the calibration of measured samples recovered in association with materials whose cultural age is known or whose age can be radiometrically determined, usually through radiocarbon dating methods (Meighan 1976).
Hydration rinds smaller than one micron often cannot be resolved by optical microscopy. The Failure of Obsidian Hydration Dating: Sources, Implications, and New Directions.