I just roasted some decaf for a friend. It had been years since I roasted any decaf and it was my first decaf on the Bullet. Yikes! What an embarrassment. Just charred little carbon shells. I had wanted a dark roast but this was way past that.
What I’ve read suggests I used way too much heat too early. Pre-Heat was 392F (what I use for non-decaf beans, 550 gm load) and IBTS temp when I dropped the beans (432F) was about what I would want for a City roast. But this was beyond a Vienna… very black and no sign of oil on the surface. Plus a little powdery black dust left behind in the drum. IBTS rose very fast after FC ended (hard to hear, but I had expected that).
And that was the third batch. The first 2 batches (IBTS of 441F on first batch, 437F on the second) were even worse. Frankly I’m surprised the beans didn’t ignite when I dropped them.
If anyone out there can offer some decaf-guidance I’d appreciate it. At the moment I’m only dangerous!