tried to distill some birch oil today on my garden chiminea. I think I either cooked it too long. Or let too much gas escape, by putting to many holes in the lid. Or it was because I used predominantly paper birch bark. I ended up with a trace amount of sticky residue. And all the birch bark was reduced to carbon. It's a shame, as it takes a while to harvest the bark when I don't get many opportunities to acquire any. Also, the paper birch I harvest, is quickly exhausted until the weather/natural growth produces more loose bark. Does anyone also make birch oil? Do you think the ventilation holes on the top of the can may have let too much gas escape?