Surface of agarwood: Natural agarwood has wood fiber and oil, and the surface will form irregular lines, which feel like oil but not like oil, while fake agarwood lines look consistent, evenly distributed and have large pores, which may fade after playing.
Burning with fire: This method is a little violent, but most directly, heating is recognized by smelling the fragrance. You can also use a hot needle to burn the flavor. The fake agarwood smells irritating and impure.
Aquilaria knowledge is extensive. I suggest reading "Unlocking the Mystery of Aquilaria sinensis Investment Collection", which will help you. .