.. And for 'traditional staining' in Jawa, not only the preparation of "mutih" the blade is absolutely important, but also the formula of mixing the ready-to-use warangan. (The art is here. I have certain friends in Solo who has private empirical solution to make a better warangan, such as -- mixing the warangan with 'spoiled rice', and so on). According to my experience -- and also my keris-stainer friend in Solo -- warangan liquid made of (we call it) "warangan apotik" (literally means 'drugstore arsenic' or chemical arsenic), usually is quick reacting but more corrosive. After couple of months stained with "warangan apotik" then usually the edge of the keris usually "ngrikit" (corroded). Maybe because of the purity of the arsenic.
That is why in Yogya and Solo, people still prefer to choose "natural arsenic" or we usually call it "warangan". Traditionally used by our ancestor in the past. Usually, chinese warangan (imported from China). Even we don't use local (Indonesian) warangan, because of the worse quality then the chinese...
The impurity of the arsenic in warangan, maybe the clue... Not too corrosive as "warangan apotik"...
GANJAWULUNG
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