Heres how to tell.....
Pine is soft, you should be able to sink your nail in
Oak is very pale and often compared in pattern to a beach. it has short fragmented lines.
If the other two dont fit its maple...or its something else...to be honest all three woods are so diffrent that if you think it could be any of those three it really could be anything.
Also bleaching a stick would be bad because it would absorb in the wood. bake it and even if it is pine...it IS a stick and not wood chips so most of the bad surface oils would be baked away, not much would come to the surface again, it is dead so it will not give off much more oil or resin