Cool read. Didn't know they were caused by the ash melting! Here's one interesting point i picked up.
Interesting read. I used to get a lot of clinkers when burning primarily Siberian elm. Since I have gotten on the 3+ year plan, bark rarely makes it into the stove and I haven’t had any clinkers for the last two burning seasons.
I pretty much only burn elm that was barkless, before I buck and split it. I get clinkers from this elm, as well as from box elder. I burn a ton of ash, have the last new years and I never get clinkers from ash. Just green the barkless elm and the BE.
We hardly even get clinkers but we've been burning post oak for the past three weeks and have more than we've ever had. They easily break up and have not been a problem.