The short answer is you don't. As the burn is black all you can do is sand it out and revarnish the wood.
Hard wood
Yes, it burns very hot. Many find the smell unpleasant, but it is as safe as any other wood to burn.
Juniper wood most likely. It is a wood found from trees in the northern hemisphere.
Place the survival guide book on the wood then burn it with the black puffle let the black puffle be close to the wood then it goes burning.
No it is not safe to burn it.
for wood to burn you need fire
Both. Heated wood gives off gasses that burn. Charcoal (carbon) will also burn.
for wood to burn you need fire
E. F. Kurth has written: 'Volatile oil from western juniper' -- subject(s): Western juniper, Wood oil
get it as a starter pokemon from professor juniper
Petrified wood- wood that has turned to stone. Any other wood WILL burn, some better than others.