....but is this ivory?

[Green]

I bought this small keris for a modest price mainly because I like the quranic carvings on the hilt and probably it is ivory. The seller swear that the hilt is ivory and not some form of plastic. I have a lot of misgivings as I don't see any clear ivory charateristics although one can see one obvious crack towards the end of the hilt. But it did not look like a typical ivory crack but more like due to heat expansion or such like.

If one looks closely enough we can see v small cracks on the lines of arabic /quranic calligraphy and a few others but nothing v obvious.

So i need your expert help to give your opinion: (1) is this hilt ivory? please do not ask me to do hot pin test as the mendak is firmly glued to the hilt (2) why the black stains on the hilt?