DeanOK Senior Member Joined: 24 Sep 2012 Posts: 724 Location: OK Expertise: I like coffee
Espresso: QM Vetrano 2B Grinder: Vario W
Posted Sun May 11, 2014, 5:55pm Subject: New Batch of Beans... too late??
I ordered a 4lb batch of beans last weekend that roasted and shipped on Monday. They arrived Tuesday or Wednesday. I have been really busy so I did not get to them until last night (Saturday). I usually fill canning jars as full as I can and then just sit the lids on the jars and let the beans outgas for a few days and then tighten the lids freeze them. Since the beans were already 6 days post roast, will they outgas enough to displace the oxygen in the jars since I waited until 6 days post? I thought I would let them sit in the canning jars until they were 10 days post roast and then freeze them.
emradguy Senior Member Joined: 31 Mar 2011 Posts: 3,431 Location: Houston Expertise: I live coffee
Espresso: Duetto II; Twist v2 Grinder: M Major, Macap M4, Pharos,... Drip: Espro presses; Aeropress Roaster: H-B "List of Favorites"
Posted Mon May 12, 2014, 8:39am Subject: Re: New Batch of Beans... too late??
Good question. I don't think there's any reliable research on how long it takes for degassing CO2 to drive out the O2 using your method. So, I think, in the end, you 're just going to have to guess when to tighten the lids. I would guess the rate of CO2 degassing decreases as one gets farther and farther from roast date (so, if I'm right about that, it would take longer to do that 6 days post-roast than 2 days post-roast). I use the same method as you, but my timeline is much shorter. I typically get my beans on post-roast day 2 or 3, divide them that same day/night, then let the canning jars sit overnight for the degas process. In the morning, I tighten down the bands and then stick them in the freezer. It seems to work just fine for me. I know you're already beyond that, but maybe it'll be helpful info to you in some way?
Remember (and you may already know this) that CO2 is denser than O2, and will remain lower in the jar, pushing the O2 out the top. So, once the beans have degassed enough CO2 to fill the spaces between them, you should be good to seal the lids tight - at least, that's the hypothesis.
. Always remember the most important thing is what ends up in your cup!
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