The engraving of the bovid was made in the same way as the copy of the horse (same lighting and simple flint flake), but with far more restraint, since the engraving is extremely fine.
On the very soft rock support of Gouy, experiments show that it is far easier to produce deep incisions like those of the horse chamber (with varied thick, thin, and deep strokes), since the weight of one's hand alone is sufficient.
Despite all the prudence thought necessary, the first engraved line, the bovid's back-line, was done too deeply, more than that of the original engraving. So the outline of the head, neck, legs, and belly and the interior fill were done more lightly, as was the triangular sign (duration of the experiment: 15 minutes).
The two flint flakes used as 'engraving points' were kept. They display few wear traces: light traces from the horse, and virtually none from the bovid.
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