Here is a kampilan with true twistedcore rod hammered and forged.
I am almost certain you can acid wash this with any kind and the twisted pattern will react to it.
Link attached:
http://www.vikingsword.com/vb/showth...tcore+kampilan
another one owned by DaveS:
http://www.vikingsword.com/vb/showth...ight=twistcore
Mandau twistcore with another nice twistcore kampilan by VVV
-what intrigue me is the mandau twistcore pattern.
http://www.vikingsword.com/vb/showth...orneo+kampilan