Palembang Keris for your comment

[Jean]

Originally Posted by jwkiernan

this black rust seems solid and stable...should the blades be soaked in WD-40 for a time?

Hi John,
You can fully get rid of the black rust spots by soaking the blade in pure vinegar or 10% citric acid for 24h or slightly more with regular scrubbings (see example) but then the pamor contrast will mostly disappear and you would need to treat the blade with warangan or arsenic oxide.... Personally and from the pictures I would opt for the full treating process.