Rick and David are correct in that this is a very recent keris of very much less than good quality. It is not an alteration.
The writing is produced by writing on the blade with a canthing using hot wax, and then soaking the blade in a corrosive medium. When the writing has been left in relief the wax is washed off with boiling water and the blade is stained.
Some of us call this type of a blade a "batik blade".
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