Yellowing Mark

Roasting on the Bullet R1
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I’m hitting yellowing stage quite consistently around 4 minutes into the roast, 145-150C.
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IBTS or Probe ?
Sounds like IBTS and other there talk 165c talk probe?

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I look for yellow-green coffee and a solid grassy odor in the exhaust. My roasts consistently yellow at roughly 155C IBTS and FC between 198-201C IBTS.

3 Likes
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I’m using yellow around the 150-160c BT 150, IBTS 165 ish. it varies a bit for me. Today I roasted some Guji and the transition wasn’t super clear so it’ was more of a guess.

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So far I am marking it at 150°C for every batch. Just for orientation. Scott Rao says that the length of Maillard phase is not that important after all.