My understanding of carbon dating is very limited, but I think it can only be used on organic substances, in addition to this, the time span involved with the keris is probably too small for carbon dating to be useful, then there are the technical problems involving contamination and the assumptions involving rate of decay. I doubt that carbon dating would be of any use for keris blades, and even if it were, I doubt that it would be relevant. To know the age of any particular keris might satisfy curiosity but that's about all.
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