Hello Moshah,
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				if the blade was made with such besi with higher carbon contain, does it mean it can easily break?
			
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 I wouldn't worry (unless one tries to abuse it as a sharpened pry bar); competent differential hardening can go a long way. If used incorrectly, the weak point (for most of the personal sidearms throughout the archipelago) would most likely be the hilt IMVHO.
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				I've read somewhere stated that besi melela was actually comes from a sandy grains along the west coast of java. Is that true?
			
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 I'm sure there were a lot of local sources; secondary iron deposits are not rare in wet climates.
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				if not laminated, means that it was not done like how a keris should be?
			
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 These are laminated (on a microscopic level) and traditional. There may be some blades made from imported European steel hiding within the wesi/besi malela category but usually you will see some forging lines suggesting extensive local forge work regardless of the primary source.
Regards,
Kai