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The result is a thin cross-section of the surfaces of the artifact.
The prepared slide is measured using an Olympus BHT petrographic microscope fitted with a video micrometer unit and a digital imaging video camera.
Narrow rinds (under approximately two microns) are usually examined under a higher magnification.
Hydration rinds smaller than one micron often cannot be resolved by optical microscopy. The Failure of Obsidian Hydration Dating: Sources, Implications, and New Directions.
Hydration thicknesses are reported to the nearest 0.1 micron and represent the mean value for all readings.