It is.....
Actualy Ibrahiim your hot pin method would only show it is horn not timber.
{Assuming the "pin" is a needle with enough residual heat to actualy burn the horn or timber enough to not only leave a permanent scar but but also to raise the fumes.}
Scientificaly one generaly uses ones eyes to percieve the structure of both horn & timber under magnification to identify them.
spiral