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Fig. 1 - flint tip made of worked obsidian.
    The first testimony there is about the use of cutting material, date back to the finding of blunted blades made of bones and firestone.
    These materials, well-worked, in order to permit a certain sharpening, will soon be substituted by the use of obsidian, the black stone, which, being harder, could permit a major resistence to daily use.

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