cheers,
there are a few more on the subject but none show this method being used on an older kris , all of the videos seem to feature newly forged knives where the damascus pattern is achieved with a known type of steel containing nickel together with steel not containing nickel but I suppose that the composition of traditional metal may have differed considerably from the ones used by modern and mostly western blacksmiths.
this other video seems to use a more scientific approach.
https://www.youtube.com/watch?v=971gfUZLC_0