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Building a bean humidor.
John Despres
Top  #26 Print Post
Posted on 03/18/2008 3:52 PM
I will be editing all my post to this thread to read 60% instead of 65%.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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coffeehound
Top  #27 Print Post
Posted on 03/18/2008 5:35 PM
From what you have said, the only thing that sounds for certain is that green beans must have a 12% moisture content. I curious why you are testing the cabinet moisture content and not the bean's moisture content? And I see that you are keeping your beans in plastic bags. Isn't that going to negate the whole project? Maybe I misread this thread, but it seems interesting, fun, but not something that is valuable to coffee storage. If the beans are at 12% when they arrive and you store them in plastic bags don't they stay nearly at 12%? Like I said, maybe I'm missing something here. Frank
 
seedlings
Top  #28 Print Post
Posted on 03/19/2008 8:08 AM

Quote

John Despres wrote:
CHAD, I'm working from this study http://www.mesoam...ial_II.PDF you might find it interesting.

I also made a mistake - 60% is condsidered safe. Not 65%.

Thanks for making me look this up!


Great info. Here's the chart from that study. To keep the coffee around 11% to 12% moisture content there is a narrow window around 60% RH.

CHAD
seedlings attached the following image:
Coffee Humidity[848].jpg
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
John Despres
Top  #29 Print Post
Posted on 03/19/2008 8:26 AM
Right, CHAD.

Hence the challenge!
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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John Despres
Top  #30 Print Post
Posted on 03/19/2008 8:43 AM

Quote

coffeehound wrote:
From what you have said, the only thing that sounds for certain is that green beans must have a 12% moisture content. I curious why you are testing the cabinet moisture content and not the bean's moisture content? And I see that you are keeping your beans in plastic bags. Isn't that going to negate the whole project? Maybe I misread this thread, but it seems interesting, fun, but not something that is valuable to coffee storage. If the beans are at 12% when they arrive and you store them in plastic bags don't they stay nearly at 12%? Like I said, maybe I'm missing something here. Frank


Frank, Good questions, good thoughts.

I'm not measuring the specific bean moisture content because I don't have the gear or knowledge of how to do it with typical home equipment. Since RH affects moisture content, I'm going on faith an RH level of 60% will give me a moisture content of 11%-12%. My premise comes from this article http://www.mesoam...ial_II.PDF

As to plastic bags, I'm keeping my beans in them until I can stabilize the cabinet. I tossed the bags of beans in the cabinet for the pictures, as I said in an earlier post. I than removed them. I don't know the beans are 12% moisture when they arrive; I imagine they are awfully close, but it can't hurt to make sure, can it?

Keeping the beans in the plastic bags will undoubtedly keep the beans just fine. Freezer bags are designed for long term storage without any problems, but plastic can be porous to some degree, depending on the materials. I noted earlier that this may not be necessary to preserve the life of my beans, but I enjoy learning and sharing, so I'm posting my journey here.

As to whether or not my experiment is valuable, it may not be, but let's find out.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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seedlings
Top  #31 Print Post
Posted on 03/19/2008 9:17 AM

Quote

John Despres wrote:As to whether or not my experiment is valuable, it may not be, but let's find out.


For me, just knowing weather or not the experiment is valuable ... is valuable, even if I don't change any of my habits. So, as you said, let's find out if the experiment is valuable!

As a side note, I have several burlap bags of greens stored (off the floor) in my unfinished basement. If I'm not going to invest in a humidor, would they be better stored in plastic bags? Assume my basement is 65F with <60% humidity all year around. Am I loosing moisture content, and if so, how will that show up in the cup? I understand how mold will affect the cup.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
John Despres
Top  #32 Print Post
Posted on 03/19/2008 9:50 AM

Quote

seedlings wrote:

For me, just knowing weather or not the experiment is valuable ... is valuable, even if I don't change any of my habits. So, as you said, let's find out if the experiment is valuable!


I agree, so will press on. I may have made a mistake yesterday. I opened the door to let the RH drop to room level. I intended to close the door once the meter showed a reading of 30% or so. Then my family came home, I got distracted, went to dinner, went to the funeral home, went for drinks, went to bed and found it open this morning. That's way more open time than I planned on.

The reason I opened it at all is to see if the RH would climb back up to the same level it was when I opened it up. I have removed everything except the 3 oases and the open & close experiment is to see if they have enough oomph to bring the RH back up.
Edited by seedlings on 03/19/2008 10:13 AM
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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John Despres
Top  #33 Print Post
Posted on 03/19/2008 9:54 AM

Quote

seedlings wrote:

As a side note, I have several burlap bags of greens stored (off the floor) in my unfinished basement. If I'm not going to invest in a humidor, would they be better stored in plastic bags? Assume my basement is 65F with <60% humidity all year around. Am I loosing moisture content, and if so, how will that show up in the cup? I understand how mold will affect the cup.

CHAD


I don't know how it will affect the cup. The only reference I have is the Mesoamerican study.

I wish I had the money to buy enough beans to waste on a loss. Ok, I know it wouldn't be a "loss" based on outcome, but it's money I don't have.
Edited by John Despres on 03/19/2008 10:34 AM
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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EddieDove
Top  #34 Print Post
Posted on 03/19/2008 10:25 AM
In my simple understanding (perhaps, very simple), if moisture content of the bean is way too low, then there won't be enough moisture within the bean for the Maillard Reactions to take place, thereby stunting the development of flavors.

I would posit that storing in burlap bags at a moisture level too high, might expedite the coffee defect known as "baggy," but that is just a hunch.
Edited by EddieDove on 03/19/2008 2:45 PM
Respectfully,

Eddie Dove

The South Coast Coffee Roaster
vita non est vivere sed valere vita est
Home Coffee Roasting Blog and Reference
http://southcoast...gspot.com/
 
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John Despres
Top  #35 Print Post
Posted on 03/19/2008 12:12 PM
You are correct, Eddie. I just re-read the article in the current issue of Roasters Magazine and spent an hour or so reading on line. While the chemistry evades me to a great degree, moisture does indeed affect the Maillard Reaction. Too much moisture or too little will alter and degrade the results in just about any food preparation.

We need a scientist who can explain this for us lay-folk.
Edited by John Despres on 03/19/2008 12:14 PM
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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seedlings
Top  #36 Print Post
Posted on 03/19/2008 12:53 PM
I bet you can store your fruits and floral arrangements in the humidor and actually impart some added flavors? Could you imagine a Sumatra with hints of cherry and rose? Fun.

That being said, maybe I should move the bag of dog food. ;)

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
John Despres
Top  #37 Print Post
Posted on 03/19/2008 1:06 PM
Well, I have been keeping some beans in a used pepperoni pizza box just to get my 6 year old more interested in coffee... "No thank you, Daddy. Coffee is for Daddies, not big boys". He turns down a sip of ale the same way.

Dog food HA!
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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coffeehound
Top  #38 Print Post
Posted on 03/19/2008 6:59 PM
Thanks for the response and the article, it is very interesting. I imagine that ziplock bags would be about as effective at been storage as the cocoons they talk about in the study. The rest of the study is about bean stored exposed to the environment in bags, which I see is what the 60% RH is all about.
 
John Despres
Top  #39 Print Post
Posted on 03/19/2008 7:22 PM
The difference, I think, is the cocoons have a moisture source to ensure the RH remains at a constant 60%. But the article doesn't really say how they did it.

I wish I knew... So far things aren't as easy as I thought it'd be.

I'm not discouraged, though. Like I said: if it doesn't work as a humidifier, I'll still have a pretty nice cabinet to keep my beans stored in plastic bags in.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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Kaffee Bitte
Top  #40 Print Post
Posted on 03/20/2008 3:40 PM
That is very cool John! Wish I had the space to do something like it.

Of course I really wouldn't need to. It is rare for a coffee to hang out at my house for longer than a month.
Lynn

"Some days it's spice, other days it's bitter dirt."
 
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John Despres
Top  #41 Print Post
Posted on 03/20/2008 4:29 PM

Quote

Kaffee Bitte wrote:
That is very cool John! Wish I had the space to do something like it.

Of course I really wouldn't need to. It is rare for a coffee to hang out at my house for longer than a month.


Thanks, Lynn

Actually, it was space that forced me to think vertically.

Besides, truth be told, beans don't last that long here, either. If it works I can keep more "private reserve" on hand. You know, the stuff I won't give away, like Kona, or last year's crop of Aussi Mountain Grown...
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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Kaffee Bitte
Top  #42 Print Post
Posted on 03/20/2008 9:42 PM
Aussie Mountain Top Estate? MMMMMMMMMMMMMMMMMMM!!

One of my personal all time favorite coffees. LOVE IT!!! I adore it as a single origin espresso! Just roasted some for it in fact!
Lynn

"Some days it's spice, other days it's bitter dirt."
 
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John Despres
Top  #43 Print Post
Posted on 03/21/2008 7:56 AM
That's the one! Early in my roasting carreer, I bought a five pound bag. It was so good, and I was so terribly entusiastic that I shared lots of it with friends... now I have precious little left for myself.

Lesson learned.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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John Despres
Top  #44 Print Post
Posted on 03/23/2008 3:37 PM
Hmmmm. I'm not getting anywhere fast with the Propylene Glycol oases. I even added three more, but cannot get the relative humidity above 47% at 65 degrees. I guess the next step will be to buy a very small room humidifier or add a small heater to the cabinet.

It looks as if I were able to keep the cabinet temperature at 70 degrees, I may be able to keep the RH at 60%.

More work to do.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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seedlings
Top  #45 Print Post
Posted on 03/23/2008 4:04 PM
OK, these are WAAAAAYYYYYY off the wall thinking... Really. Far. Off the wall...

Years ago we had 2 iguanas. They each had a heated rock. It got pretty hot, but not so much that you couldn't bear to keep your hand on it (maybe 100F?). What if you set one of your oases on a heated rock? Or maybe a candle warmer? Have you seen one of those things? Once your candle has burned down, you put the rest of the jar of wax on a mini hot-plate. Or, what about a teensy little crock pot, like the ones for potpourri?

So, there's my off-the-wall suggestions for you.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
John Despres
Top  #46 Print Post
Posted on 03/23/2008 6:08 PM
Hmmmm. A moist heat source... I'm stroking my beard on that one. Hmmm... Could just work.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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Kaffee Bitte
Top  #47 Print Post
Posted on 03/23/2008 6:43 PM

Quote

John Despres wrote:
That's the one! Early in my roasting carreer, I bought a five pound bag. It was so good, and I was so terribly entusiastic that I shared lots of it with friends... now I have precious little left for myself.

Lesson learned.


Yes I made the same mistake. Not any more though. It all gets roasted for me alone. If my friends are VERY LUCKY, I may be nice enough to make them an espresso out of it. But they have to be very very nice to me.
Lynn

"Some days it's spice, other days it's bitter dirt."
 
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John Despres
Top  #48 Print Post
Posted on 03/25/2008 5:46 PM
I'm temporarily setting aside the project because I need a place to put my beans. The cabinet will work perfectly even if it's not a humidor. Once I get more time, I'll install a plenum up the back with ports and a small mister.

Besides, I need to get back to the Junk Yard Tow Truck and finish the up since I messed it up...
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
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seedlings
Top  #49 Print Post
Posted on 04/24/2008 7:58 AM
John, hows the experiment?

I was thinking ... would a refridgerator work for a humidor? One not plugged in? It's airtight.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
mikepetro
Top  #50 Print Post
Posted on 03/10/2012 7:45 PM
John,

This is a really old thread but I was wondering if you ever pursued it further. And if so was the view worth the climb?

I am at a turning point. I have read a lot about green bean storage and it seems vacuum sealing is gaining quite a bit of momentum.

I have a Foodsaver and lots of canning jars so that has a certain appeal. Put 227g of beans in a jar and suck a vacuum on it, pretty easy.

But the controlled environment thing still intrigues me a lot. I know from aging tea that in a controlled environment you can manipulate the flavors a bit. I fashioned a very functional cooler-dor for my cigars, it maintains 70% humidity perfectly and since I use a ?Cigar Oasis? like device it could easily be adjusted down to 60%. It would hold about 100 pounds of beans.

Has anyone tried nitrogen flushing for ultra high end beans, the special bursting with fruit beans I hear about? I did that for high end Japanese teas and I still have all the gear. See: http://pu-erh.net...taticID=12

Any advice from anyone of quality easy storage methods?
Mike Petro
Martinsville, VA
--------------------------------
Lady Silvia, Stepless Rocky, Gene Cafe
http://mikepetro.org/coffee/
 
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