Johan, a keris blade is made by forge welding a piece of steel between two pieces of pamor material that has been made by forge welding iron and a contrasting material.
If the forging is well made and then well carved, the edge of the steel core projects beyond the pamor material around all the edges of the blade.
The diagram that Detlef has drawn shows the steel core where it has emerged from the pamor and now forms the edge of the blade.
The blade is in fact a laminated sandwich, pamor on the faces of the blade, steel core running through the centre of the blade and forming the cutting edges.
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