Tombak Opinions Wanted

[Nagawarrior]

I recently acquired this nice Tombak from one of our esteemed fellow formites. I'm trying to learn as much about it as possible. I can really use your help.
I understand it is hard to give an evaluation using photographs.
First of all I realize it is "out of stain" and it exhibits characteristics that make it difficult to identify as a Javanese Tombak. (Thank you to Alan Maisey for that information). If anyone might have an opinion I would love to hear it.
Another question I need an answer to is; where can one find laboratory grade white arsenic (arsenic tri-oxide) ? Does anyone know the difference between a Tahitian lime and a regular lime. Both these are needed for proper staining according to Alan's detailed instructions.