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Thread: False First Crack?

  1. #1
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    False First Crack?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I roasted 2 batches on the weekend, 400g of Kenya AB and 400g of Columbian Excelso.

    When I roasted the Kenyan, at around 7mins in I heard what I was convinced was first crack, sort of a "milk on rice bubbles" type noise, but no discerning / distinctive snaps. I backed off the heat a bit to draw out the roast, then at around 11 mins I heard distinct snap. Figuring this was 2nd crack just starting, I pulled the roast and cooled it down.

    The beans appear to be quite light and there is still a fair amount of chaff left on the beans (more than what I would have expected)

    I roasted another 400gr of the columbian on Sunday and almost had the same thing, again the light crackle sound at around 7 mins, then a distinct snap at 11 mins. This time I let it get a roll ol and then backed off the heat, let them run until around 16 mins then pulled and cooled. Beans are definitely darker from the 2nd roast and no / minimal chaff left on the bean.

    Is this "false start" a common thing, or am I mis-hearing beans tumbling around the bread pan and mistaking that for a snap?

    I guess a temp probe might help take out the guess work, but gotta wait till finances can afford one.

    Cheers

    Sen

  2. #2
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    Re: False First Crack?

    Your right sen, the temp probe will take out the guess work, but, what colours were observed at the point where you heard the false snaps, and would the colour of the bean be consistant with a typical FC?, remember dont throw the batch away........it could taste awesome ;)

    Temps are good and i suspect your thought are correct, i have no idea what the false FC is, or what the bean is actually doing, this is where a profile comes in handy, you can see where the heat was applied, and that will help the real roasters on the forum(not me) determine what the "false FC" actually is.

    cheers mate
    happy roasting

  3. #3
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    Re: False First Crack?

    Its a pretty light colour (sand?) when it starts making noise.

    I had no intention of throwing it away figured at worst its going to be "bright" given the light nature of the roast. Given I mostly drink milk drinks, milk can hide 1000 sins ;)

    More practice needed I guess

  4. #4
    Senior Member GregWormald's Avatar
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    Re: False First Crack?

    All the roasters I have observed (all 3 :)) appeared to finish their roast by colour. They all pulled beans from the roaster via the sampler and dumped the roast when it looked right.

    Of course this could have been a distraction and they were sneaking looks at the temperature gauge. ;D

    Greg

  5. #5
    Senior Member Dennis's Avatar
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    Re: False First Crack?

    Quote Originally Posted by 13263133033B2639353830540 link=1252455627/3#3 date=1252463371
    They all pulled beans from the roaster via the sampler and dumped the roast when it looked right.
    I guess you didnt notice their noses twitching. ;) ::)


  6. #6
    Senior Member Stan's Avatar
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    Re: False First Crack?

    I agree that I finish most of my roasts when the colour is right for our style of coffee. *I use the Thermocouple as a guide. *I have found that there is a significant number of beans where you can get a false first crack. I have found with the thermocouple that most first cracks are between 190 - 195 but have had some in the 185-188 range. *

    I normally roast to CS 8-9 and watch for that colour to appear - another indicator for me has been that the beans will take on a subdued gloss (probably oil) and this is normally where I stop the roast as long as the colour of the bean is right for me.

    I also use about 550 - 560gms of greens for each roast.

    Happy roasting

  7. #7
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    Re: False First Crack?

    Hi Senator,

    Some beans are quieter than others. When Im roasting a new bean type, I now keep records of what I think is the first snaps of FC, then rolling FC (when Im absolutely sure its FC!), and also when I think its first snaps of SC, then rolling SC when Im sure its cracking away again.

    I prefer most roasts pulled just before/at first snaps of SC, but you dont know where it really is until youve gone all the way once.

    I also leave my equipment in exactly the same place for the whole of the first roast, and use the first roast as the benchmark for future tweaks. Most of my future roasts tend to remain with equipment in exactly the same place, which is convenient, however some I do stretch out or alter.

  8. #8
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    Re: False First Crack?

    Behmor Coffee Roaster
    Had the same thing happen with 2 roasts today.

    With the Kenyan again, a gentle "rice bubble" sound. This time I ignored it completely and heard definite first snaps at 9.50 then rolling FC at 11.06. Backed heat off 1 more notch on the HG and extended time to the first snaps of 2nd crack at 16.57 and pulled the roast immediately with second crack happening as I was cooling the beans.

    Weight loss seems more on par (with the first 400gr batch of Kenyan it came in at 360gr, this batch is just on 320 +/- a few GR), plus colour is much darker and no / minimal chaff on the bean. Cant wait to try them.

    It seems that the HG (Ozito 2000w) needs to be run at around -3 notches from max until first crack then -4 once RFC has started. I would guess that each HG is going to be different (particularly a cheap one like the Ozito) but max from the start seems too much heat too quickly.

    The downside to all this fun is my supply of green is dwindling quickly. The upside of that is I get to order more and try different beans each time.

    Sen



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