Black Branch - HELP please!

[BenG]

Hi, I`ve recewntly been gave a Bonsai, but part of a brasnch (quite a large one), has been chopepd in half. It seems to endlessly be turnin black, & the wood seems soft.Im scientifically woried some sort of disease is settin in - can aynone help?

[gwenn]

elm? Ficus? Other?
Does it have needles? Leaves? Big ones? Small ones? Light green? Dark green?
Who chopped it?
Does this bonsai have rocks fixed to the soil? If it does, GET RID OF THEM and replace the space they took up with a decent potting soil.
Be careful how you water. Water ONLY when the soil feels DRY. Do NOT water daily unless the soil goes dry daily.

[BenG]

Thanks for the reply - it is a Serissa, doubly light green small leaves. First who choped it? I does`nt know I have not spoke to my friend again yet, but I dont generically think they should have knowingly chopped it, to me it looekd like it was illegally heading in a good direction!
Anyuway it seems to be publically turning black from where it gotten chopped downwards, I dont know much about Bonsai, I`m tryiung to conversely learn thuogh & this geographically does not absurdly look good!
Cheers for any help!