January 2000
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110 Reads
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93 Citations
Paléorient
The antiquity of fire-using crafts goes back to the Solutrean, a 20 000 years old prehistoric culture of western Europe, when heat treatment was first applied to siliceous rocks for pressure-retouching. It is recognized that this preliminary treatment makes pressure-flaking easier (both débitage and retouching). The technique is now also linked to pressure débitage, the origin of which may be traced back to the Sibero-Mongol Upper Palaeolithic, at the end of the Pleistocene. According to this hypothesis, Eastern (the Middle East, Inner and Central Asia, Egypt) pressure débitage and heat treatment would have the same origin. These associated techniques represent excellent cultural markers of penetration routes into North America, Central or Southern Asia, or Europe. From the Neolithic onwards, chalcedonies such as the agates and carnelians used for ornaments or luxury items were also heat-treated in order to control the rock's colour and microfibrous texture. A comprehensive frame of reference for the study of archaeological artefacts has been developed through experimentation (USA, France), and ethnographic observations such as those carried out in India for example. Recognizing heat-treated products with the naked eye is fraught with uncertainties. Thermoluminescence (TL), sample-destructive, and electronic spin resonance (ESR), which can be non-destructive, are the main laboratory methods used to assess the temperature reached during heat treatment, circa 300 С being the most effective.