Is Evapo Rust safe for cleaning keris?

[satsujinken]

Originally Posted by A. G. Maisey

Sulphuric acid is even more effective if speed is the criterion. Sulphuric acid will clean a blade in minutes. Aqua regia is even faster.

yeah, faster ... come back after one hour, and your blade will be completely dissolved in the solution ...

I mean really dissolved without a trace but perhaps a thick yellowish smoke ... as that thing (aqua regia - or king of water) can literally eat away ceramic blocks, dissolve gold and platinum and must be handled with extreme care ...

I myself using lime (jeruk nipis) and coconut water, and some soft steel wire brush