Jean, it might pay you to talk to a conservator, or perhaps specialist dealer in ivories about the optimum manner in which to treat and store ivory.
Additionally, you need to be aware that some woods used in Javanese keris hilts are recommended to be worn only at night and not to be exposed to sunlight.
The major problem with all heating methods other than the traditional one of direct low heat is that it is impossible to direct the heat to exactly the area required, you simply cannot control it to a sufficient degree.
By "low heat", I mean a heat which will not alter the degree of hardness in the blade. This is not particularly vital for a keris blade, but it can be an important consideration for western knives, cutlery, custom knives, and some eastern daggers.
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