Staining the blade is a more difficult proposition. In Jawa they would use warangan, basically arsenic. Some people on this forum have been lucky to get access to the lab grade stuff. For the rest of us, realgar is a mineral you can get online which has arsenic content, but the results seem inconsistent.
I have used sulfur and rice water once and it looked like itcould have been promising had I just let it go on for longer.
A keyword search will serve you well, as these have been discussed at length in many threads.
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