Ultimate weapon?

Question

well this is kinda stupid but I think I know what the ultimate disposable weapon is. Ice carved into something sharp. Once you finish what your doing with it will just melt leaving no traces of you behind.

Answer 1

I saw in a movie a bullet made out of supercold Ice.

An ice knife would not be that effective, unless we are talking of ice hardened someway.

Answer 2

you've been watching too many CSI stories ha ha

the weopon is untracable, i'll give you that but you will not melt along with it

Answer 3

An ice dart tipped with toxin is the murder weapon in the Mrs. Murphy Mystery, "Tail of the Tip-Off."