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In conventional gong making , the material grows harder and harder the more that one hammers, and this can lead to brittleness and even cracking if taken to extremes. Brass and bronze alloys are therefore frequently re-heated and slowly cooled in a process called annealing. This returns the metal to its original softer nature. With titanium this is not possible; heating the metal in fact hardens it! However, when all the cold forging is complete, the stresses in the metal