The technique for staining blades is done with warangan (arsenic and lime). If you search the site you should find some instructions on this, though obtaining arsenic can be difficult for many. Some people use industrial grade arsenic which gives a fairly consistent result while many grind up the actual mineral for the process which can be less consistent, but might be easier to get your hands on.
There are people who do this as a service, but few outside of Indonesia. Where do you live?
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