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Thread: How quickly can humidity affect Beans once opened?

  1. #1
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    How quickly can humidity affect Beans once opened?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all,

    Last night I opened a sealed bag of beans (estimate about a month old).

    Immediately after opening I used a few serves to calibrate by grinder and dose to get a decent pour and went to bed. The beans were sealed back up in the original bag and stored in the pantry.

    This morning I repeated the process with exactly the same grind, weight, tamp and the machine choked. I increased the grind and lowered the dose and the machine choked again. I had to dramatically coarsen the grind to get the shot to even flow.

    Am I on the right track in thinking that either the initial CO2 degassing (the bag was like a balloon before i opened it) or initial influx of moist winter air is responsible for such a dramatic change in only 12 hours?
    Last edited by stralto; 21st July 2017 at 11:10 AM. Reason: spelling

  2. #2
    Senior Member level3ninja's Avatar
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    Maybe. I would think that it would be more likely to be too coarse if the beans had "aged".
    Choking suggests that you might not have sufficiently purged your grinder inbetween changes. Were your last couple of changes last night to make the grind finer? If so I think that is the likely culprit.
    Last edited by level3ninja; 21st July 2017 at 05:37 PM.

  3. #3
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    Quote Originally Posted by level3ninja View Post
    Maybe. I would think that it would be more likely to be too coarse if the beans had "aged".
    Yes, which is why i suspect its due to the immediate humidity or CO2 release (not the age).

    Quote Originally Posted by level3ninja View Post
    Choking suggests that you might not have sufficiently purged your grinder inbetween changes. We're your last couple of changes last night to make the grind finer? If so I think that is the likely culprit.
    Grinder was definitely purged. In both cases, last night and this morning, I ran two doses through consecutively (and this morning ran a few beans before that).

  4. #4
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    I find that coffee beans stay fresh for 3 days after opening. This is from my experiences only, but I base this on the fact that when I buy top quality beans from the likes of Campos, Mecca or Toby's Estate in Sydney, the first 2-3 days I get a beautiful, smooth velvety extraction in the shape of a reverse cone (from my bottomless portafilter on the Silvia), but on the 4th day, it starts to squirt and spray a thin watery mess.

  5. #5
    Senior Member level3ninja's Avatar
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    Behmor Brazen - $249 - Free Freight
    Have your considered adjusting your grind to suit? Grinding requirements change with age.



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