The researchers worked with a professional stonemason to imitate the ancient engravings with tools made from different materials, including bronze, stone and a tempered steel replica of the 2,900 ...

The result was also confirmed experimentally by undertaking trials with chisels made of various materials: Only the chisel made of tempered steel was suitably capable of engraving the stone.

The result was also confirmed experimentally by undertaking trials with chisels made of various materials: only the chisel made of tempered steel was suitably capable of engraving the stone.