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In page Prismatic blade:

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The production of prismatic blades creates not only a very standardized final product, but also a standardized waste assemblage.[2] The analysis of obsidian debitage can reveal whether or not prismatic blade production occurred at a site and, if it had, what stages of production the process included. In other words, the types of manufacturing waste present (e.g., rejuvenation flakes and/or blades, platform rejuvenation flakes, etc.) at a site can inform archaeologists about the stage in which blades were being produced.[3]