I agree with BlueErf that this is a keris from the Malay peninsula, probably Terengganu. I also don't think it is particularly old. Sometime before or after WW 2 is likely.
As has been mentioned, the staining of blades is not particularly traditional with Malay blades so that step would be unnecessary. If the hilt can be easily removed soak the blade in pineapple juice and brush the blade regularly with an old toothbrush until all the rust has been removed. This is not a simple "dipping" process, it could take days.
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