It was not attainable to mass manufacture metal or pure iron because of the excessive temperatures required. Furnaces might attain melting temperature but the crucibles and molds needed for melting and casting had not been developed. Steel could presumably be produced by forging bloomery iron to reduce the carbon content in a considerably controllable method, however steel produced by this method was not homogeneous. The Middle Paleolithic, roughly 300,000 years in the past, noticed the introduction of the prepared-core technique, the place a number of blades could probably be quickly shaped from a single core stone. The Upper Paleolithic, starting approximately forty,000 years ago, saw the introduction of pressure flaking, where a wooden, bone, or antler punch might be used to shape a stone very finely.
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