HomeRoast Digest


Topic: update on bean moistening (5 msgs / 119 lines)
1) From: peterz
As I promised, I weighed out 600 Gr of beans and put them in a Ziplock 
with 100 Gr of water; and sealed the bag.
Within a few hours the bag was flat and hard, just as if I had vacuum 
sealed it, when in fact I left some air in it so I could shake them and 
see if there was drops of water on the inside of the plastic.
How did the beans create a vacuum by absorbing water???
Sure befuddles me, but then I HAVE had a margarita or two, this evening.
Will think about it some more tomorrow..
and so,
 to  bed
PeterZ, in LHC, where it is still raining....
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2) From: Benjamin VerHage
Not so much a vacuum, but as air cools it compresses, and as it heats it expands. If you thaw the bag I bet the air will expand to the original amount.
Ben
From: peterz 
To: homeroast
Sent: Saturday, February 7, 2009 8:25:39 PM
Subject: [Homeroast] update on bean moistening
As I promised, I weighed out 600 Gr of beans and put them in a Ziplock with 100 Gr of water; and sealed the bag.
Within a few hours the bag was flat and hard, just as if I had vacuum sealed it, when in fact I left some air in it so I could shake them and see if there was drops of water on the inside of the plastic.
How did the beans create a vacuum by absorbing water???
Sure befuddles me, but then I HAVE had a margarita or two, this evening.
Will think about it some more tomorrow..
and so,
to  bed
PeterZ, in LHC, where it is still raining....
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3) From: Dave
He doesn't say anything about freezing...
Dave
Some days...
It's just not worth chewing through the leather straps
On Sat, Feb 7, 2009 at 10:21 PM, Benjamin VerHage 

4) From: peterz
Hi Ben,
Nope I did not freeze the bag.
I just left it up on the counter so that the dog could not get at it.
Last night I opened the bag to release the hard packing, and it is now 
loose like I left it.
Upon inspecting the beans, some of them are about twice the size as they 
were originally, before I added the water.
Looks like the ones I dumped the water on, absorbed it, but the 
swelling, or the moistening,did not balance out.
I will wait until this evening to roast them. Bag is still sealed.
Any advice as to if I should add more water or not?
PeterZ
Benjamin VerHage wrote:
<Snip>
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5) From: raymanowen
Roasting temperatures will definitely evaporate all of the water.
The drying phase of roasting will take a lot more heat and time, until all
of the moisture is driven off. Then batten down the hatches- with the
moisture gone, the temperature will skyrocket.
At this point, before 1st Crack, the roast might appear to become exothermic
and "take off," because the water takes so much energy to convert to steam
at 212 F.
Any glass in your roaster may tend to become shrapnel- be careful!
Cheers, Mabuhay and Magandang Gabi -RayO, aka Opa!
Thermo-dynamic coffee...
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