On my my NC30, which I run hard, the plume is totally clear after a brief startup plume of say 10 minutes.
That's what I got today, starting totally cold.
I have a 15° offset that goes around the eve of the roof, so I can't see past that, but down to that it is all black and looks tarry, though I didn't actually feel it. But only brown and gooey on the outside of the cap and a little down the outside of the chimney.
I first put in an older smaller stove back in early January. The chimney was put in new at that time as well. I ran that stove a couple weeks then bought the 30 cause I was tired of stoking every couple hours.
I also am burning inferior wood. Some is fresh cut dead elm that has a MC in the low to mid 20s, the rest is some mixed, mostly softwood, that I bought from a man that said he didn't need it. Being my first purchase I never thought to check it too close. It turned out to be very dirty wood, then got worse when we moved it on a very muddy day. Lesson learned.
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