Museum Radya Pustaka in Solo, Jawa Tengah, used to periodically clean and stain tosan aji that was on display, I do not know if they still do. The administrative arrangements for this museum changed not so long ago, so anything is possible.
In Australia there was at least one museum conservator who was trained in traditional Javanese cleaning and staining methods, and one museum curator who had a good understanding of the processes involved. They both received their training and instruction more than 25 years ago, so I do not know the current situation.
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