I had a look at that Bob, really impressive.
But where keris are concerned I like to use an aromatic oil, my preference is a mix of a base oil, usually medicinal paraffin or Singer sewing machine oil, and the sandalwood oil with a touch of kenongo oil. But in Jawa, although my mix is probably the most frequently encountered, some people will use other aromatic oils, such as rose, or jasmin.
The reason I like to use aromatic oil is threefold, I like the smell, I don't want to insult any presence that might be in the blade (just because I cannot detect a presence doesn't mean that there is none), and lastly:-
https://www.youtube.com/watch?v=gRdfX7ut8gw