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Thread: Do all beans go through first crack?

  1. #1
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    Do all beans go through first crack?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    First time roasting Brazil Peabody and FC was all but missing. I heard about 3 pops at 11:38 and that was it, nothing.

    So do all beans go through FC (or SC for that matter)?

    Maybe I did something wrong? Below is the profile. 100% heat and charged at 150C chamber temp, drop to 75% at 100C BT and then 50% at 200C BT. I kicked it back up to 75% trying to "encourage" FC by adding more heat but nothing heard till SC. Charge weight was 250gm, ambient temp 14C, humidity 75%.

    Thoughts?

    046 2016-08-08 Brazil Peabody SCs+0.03 19%.png

  2. #2
    Mal Dimal's Avatar
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    Some "Peaberry" beans (and normal ones too) have a very quiet 1st-Crack and may be difficult to hear when in progress. If the batch made it as far as 2nd-Crack, given the profile you have recorded, then they certainly achieved 1st-Crack along the way. You should be able to tell by inspecting the beans though...

    Mal.
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  3. #3
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    Ok, dumb question coming so be warned, how can I tell if FC occurred just by looking at the beans? I've always just listened for it.

    The 3 or so pops I did hear at the start of FC were quite distinct so I was expecting the rest of FC to be similar. Obviously wasn't the case.

    Btw SC was quite audible, about 3 seconds of snap crackle pop before I realised I was listening to SC and not a late FC

  4. #4
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    Sight and smell tend to give away where a roast is at if the cracks are not that audible. Use all the senses except touch but add common sense and you'll be ok no matter the bean.

  5. #5
    Mal Dimal's Avatar
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    Good info to be found on the Sweet Maria's website...
    https://legacy.sweetmarias.com/libra...e-degree-roast
    Roasted Coffee Comparison: Surface Color and Texture Versus Ground Samples

    Many other resources located here too, so search away...

    Mal.
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  6. #6
    Life-long Learner DesigningByCoffee's Avatar
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    That's why using a temp probe is so handy. Some of the most amazing beans I've ever roasted were the Maui Mokka from a few years ago. They were tiny peaberry style beans and there was no first crack that I could hear. But played it by the numbers. Had to drop a few degrees earlier as second crack came on, but easily done when you know the 'zone' you are hunting for.
    Dimal and sprezzatura like this.

  7. #7
    Senior Member sprezzatura's Avatar
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    Behmor Coffee Roaster
    Quote Originally Posted by Dimal View Post
    Good info to be found on the Sweet Maria's website...
    https://legacy.sweetmarias.com/libra...e-degree-roast
    Roasted Coffee Comparison: Surface Color and Texture Versus Ground Samples

    Many other resources located here too, so search away...

    Mal.
    That's a great piece they did; another on roast depth with the Behmor is great!
    Dimal likes this.



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