Posted Fri Jul 2, 2010, 11:46am Subject: Exposing beans to air after roasting
I have roasted for years, but always wondered how long the beans should be totally exposed to air before placed in bags with a one way valve for storage and use. I have recently been letting them sit in the collander overnight, but wonder if this is too long. Is there a rule of thumb? Thanks so much. Art
Posted Fri Jul 2, 2010, 1:00pm Subject: Re: Exposing beans to air after roasting
asiegel Said:
I have roasted for years, but always wondered how long the beans should be totally exposed to air before placed in bags with a one way valve for storage and use. I have recently been letting them sit in the collander overnight, but wonder if this is too long. Is there a rule of thumb? Thanks so much. Art
I do the same thing when roasting a big batch. I let it sit in a stainless bowl overnight, and the next day put into my containers. Since it is degassing during that perior of time, for convenience sake I cannot see why you have to bag right away.
Len
"Coffee leads men to trifle away their time, scald their chops, and spend their money, all for a little base, black, thick, nasty, bitter, stinking nauseous puddle water." ~The Women's Petition Against Coffee, 1674
Posted Fri Jul 2, 2010, 1:07pm Subject: Re: Exposing beans to air after roasting
asiegel Said:
I have roasted for years, but always wondered how long the beans should be totally exposed to air before placed in bags with a one way valve for storage and use. I have recently been letting them sit in the collander overnight, but wonder if this is too long. Is there a rule of thumb? Thanks so much. Art
The one way valve on a coffee bag is designed to lets air out. It allows the coffee roaster to bag and seal almost immediately after roast. If you are not going to use a bag with a one way valve it appears that the general consensus I have read is 12 to 24 hour prior to sealing up tight.
I use canisters to store so I personally use 12 hours. This is guidance I got from the 3 local coffee roasters.
Posted Fri Jul 2, 2010, 4:14pm Subject: Re: Exposing beans to air after roasting
Thanks for the prompt responses. Much appreciated. I have bagged immediately with the one way valve bags (I now use those Sweet Maria cannisters with the one way valve that work great) but my pours do seem better when I go the overnight air treatment route first. Perhaps the degassing does not occur fast enough over the 5 days or so that I use the coffee?
Posted Fri Jul 2, 2010, 4:44pm Subject: Re: Exposing beans to air after roasting
My roasts go directly from the roast and cooling into the clamp-lid preserving jar and into the cold and dark freezer. I intend to arrest the staling process from the very start. The jars pop slightly when I first open them. I stagger my roasts so that the newly-roasted beans get a chance to rest for at least 24 hours before brewing.
brownroaster Senior Member Joined: 20 Apr 2008 Posts: 101 Location: pennsylvania Expertise: Pro Roaster
Espresso: Krups, serena Grinder: La Pavoni burr grinder Drip: Bunn bodum french press Roaster: Fresh Roast, and popcorn...
Posted Sun Jul 11, 2010, 5:12am Subject: Re: Exposing beans to air after roasting
I am glad you brought this topic up...I have experimented with different methods, from placing them in cool whip containers for 24 hrs, to canning jars, and now I just put them right into the bags. I have never tried the method that Len uses...may have to try that out...I get scared doing it that way due to mosquitos or any flying insects getting into the beans. Have you guys ever had a problem with that...
harmolodic Senior Member Joined: 8 Aug 2006 Posts: 123 Location: DC Expertise: I love coffee
Posted Tue Jul 13, 2010, 12:18pm Subject: Re: Exposing beans to air after roasting
There's a lot I don't know about the science of this, but I've always thought we are trying to do two things with our freshly roasted coffee: 1) allow C02 out of the beans, and 2) prevent oxygen from getting to the beans (to forestall oxidation).
I would think either the one-way valve bags (my preferred method) or Mason jars would work best (opening jars briefly from time to time). Letting the beans sit out in the open might make for quicker degassing, but wouldn't oxidation occur much more rapidly?
DavecUK Senior Member Joined: 21 Sep 2005 Posts: 941 Location: UK Expertise: I love coffee
Posted Tue Jul 13, 2010, 1:09pm Subject: Re: Exposing beans to air after roasting
Many years ago, I did some work for a very large Italian roaster who used to leave the coffee out overnight before packing and them place them in foil bags, no one way valve and then simply punch a hole in them so they wouldn't inflate up/burst in transit. Needless to say the coffee was not great and certainly unless got quite fresh was very poor. I spoke to them about it and was told that was the way they had always done it and that it was the best way. I made my point about reducing any exposure to air after roasting (as much as it practical), packing as fast as possible and using 1 way valve bags. They now pack all their coffee this way and it tastes far better and lasts much longer.
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