ABSTRACT In Europe, intentional heat treatment of silica rocks to improve their knapping quality appeared for the first time during the Solutrean (ca 25.5–23 ka cal BP). The recognition of heat-treated artefacts in assemblages is based on macroscopic criteria like shiny luster. Surface luster or gloss, however, may be prone to observer bias and calls for more objectives measures to quantify it. In this study, we use a laser scanning microscope to measure the micro-relief on surfaces knapped after heat treatment at different temperatures. Our results show the evolution of the roughness of fresh fracture surface as a function of heating temperatures. Roughness appears to be a good proxy for macroscopically observable surface gloss caused by heat treatment. Such Ra measurements even bear the potential to become a new tool for the recognition of heat treatment.

中文翻译：

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了解热处理切Cher石有光泽表面的初步结果

摘要在欧洲，在Solutrean（ca 25.5–23 ka cal BP）期间，首次出现了对硅石进行有意热处理以提高其绑扎质量的方法。组件中经过热处理的人工制品的识别基于宏观标准，例如光泽。然而，表面的光泽或光泽可能会易于观察者产生偏差，并需要采取更多的客观措施对其进行量化。在这项研究中，我们使用激光扫描显微镜来测量在不同温度下热处理后被卡住的表面上的微浮雕。我们的结果表明，新鲜断口表面粗糙度随加热温度的变化而变化。粗糙度似乎可以很好地替代由热处理引起的宏观可观察到的表面光泽。