burnt

Hey folks! I bought Andrew Salkin’s subitism heater couple of months back on recommendation by well known members. I found that the wood at the bottom of the burner is burnt in a few usages. Has this occurred to anyone else?

Newbie here. In the Middle East , Fumigation of Oud is done via traditional charcoal method where its put over after a layer of ash is formed. But when i do it with Hindi Agarwood chips on charcoal(Coconut husk) i get a charcoal like burnt smell . people have suggested to use a mica plate or...