One more question about this Bali sword. We can observe some damaged dents on this Keris, which may have resulted from later use and collisions. However, it's intriguing that the damaged areas of the sword still remian the same black color as the surface. It is known that the black surface of Keris comes from a soaking process after forging, so the black color on the surface should not penetrate into the interior. Then why is the interior of the scratch still black after the surface has been damaged? Does it has any relationship with the material?
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