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Thread: Sight or Sound??

  1. #1
    Junior Member
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    Sep 2007
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    18

    Sight or Sound??

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    ok, ive sussed the popper so its consistent, i have my starter pack, and im roasting until my hearts content. I have started to figure out the difference between FC and SC, still not sure about the rolling thing, but im learning.

    My questions are:

    What is more important, sight or sound?
    Should i roast per the different cracking phases, or should i roast to colour?
    What is the realtionship between the cracks and the colour?

    cheers
    scott


  2. #2
    Senior Member
    Join Date
    Nov 2006
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    979

    Re: Sight or Sound??

    OK some people may disagree with me here. Not facts just an observation. Im curious as to whether others find this.

    Cracks are a very general guide to roasting. They give you a ball park when you first start out. However different roast profiles, equipment etc will result in the cracks coming earlier or later in comparison to the color of the beans.

    a popper for example which usually gives a very fast roast will give you an early second crack and you may want to darken them a bit past this point. on the other hand a Gene Cafe that gives comparatively slower roasts will have a delayed second crack, particularly if you back the temp off after first crack. roasting past the first snaps of second give a roast that is two dark for my pallet.

    So in general I think that flavor is determined more by color then by snaps.

  3. #3
    Mal Dimal's Avatar
    Join Date
    Oct 2004
    Location
    Warwick, QLD
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    16,878

    Re: Sight or Sound??

    Behmor Coffee Roaster
    I use the following as a guide and if you can stretch to buying a Temperature Data Logger then thats an additional measurable harbinger of the roast progress...

    1. Weigh the bean batch to be roasted.
    2. Preheat the roaster to around 100 C (ensures consistency with subsequent roasts).
    3. Use a Stop-watch to provide a guide of when to expect roast progress milestones.
    4. After the initial release of "chaff" and just prior to the start of 1st-Crack, some more chaff is released as the beans
    swell and split the parchment.
    5. Note the time when 1st-Crack starts, the Colour of the beans and then when 1st-Crack Rolls.
    6. Note time when 1st-Crack Stops (dont worry about the odd late bean popping), and colour of the beans.
    7. Closely observe the Colour Progression as the roast proceeds from the end of 1st-Crack towards 2nd-Crack.
    8. Look for signs of smoke as the beans darken.... The roast can be halted any time now when the beans achieve the
    colour your striving for.
    9. Note time of the first snaps of 2nd-Crack... Go to be careful now as the roast can progress very quickly from this point
    on.
    10. Listen for the start of Continuous Snapping as 2nd-Crack starts to Roll.
    11. Stop roast and immediately cool beans when Rolling 2nd-Crack has progressed to the point desired, but certainly
    no further than 20-30 seconds otherwise you risk charcoal beans.

    Additional steps that can be added in if you have a Temp. Data Logger....

    3(a). Adjust Heat Source (if possible) so that Bean Mass Temperature increases at the rate of 4-5C per minute.
    5(a). Note the Bean Mass Temperature when 1st Crack starts to Roll.
    6(a). Reduce the Rate of Temperature Rise, if possible, by adjusting the Heat Source. Try and achieve a rate of 2.0C per
    Minute.
    9(a). Take particular note of the Temperature when approaching 2nd-Crack, when it starts and when Rolling 2nd-Crack
    starts.

    And thats about it :P. Maintain a Roast Log to record the milestones and Cupping Notes of each individual roast so that you can adjust future roasts to "fine-tune" the outcome to your flavour preference and then... Enjoy! :) [smiley=laugh.gif]

    Cheers,
    Mal.



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