HomeRoast Digest


Topic: uneven roast (6 msgs / 203 lines)
1) From: MSMB
I have just roasted my first batch of an African peaberry in my IR.  I
mostly drink Central American Coffee, so this is something new for me.  My
IR runs hot so I use 320 for 4.5 minutes, 340 for 2.5 min., and 440 for 4.5
minutes.  But typically I cut this off after 8.5 minutes, just into 2nd
crack.  I roasted 76g, just as I always do with my Central American beans.
However, at the end of this roast I must have had 3 grams of beans that
looked under-roasted; color light tan. There was some unevenness in the
other beans, though they were much darker; different variations of the color
of coca cola.  There was also more chafe left in the roast than I am
accustomed to have.  It was not hard to just turn the beans and blow it
away; there was also little chafe in the holder.  I suppose that because it
is a smaller bean the chafe clings more and is just being blown off by the
end of the roast.  But what about the "defective" beans and the unevenness.
Would anyone venture a guess that this is a problem with the roaster or just
the nature of this particular bean.  
MS
Homeroast mailing list
Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20

2) From: Bob
That sounds normal for African beans ~ Ethiopians are notorious 
for multi-hues in the finished process. I've noticed it in 
Tanzanian peaberry too. Africans are not the chaff monsters that 
a Brazil can be, but they hold their own.
Leave the "defective" beans in there, unless they obviously did 
not hit first crack, they make up the unique flavor of Africa.
Bob - Parker, CO

3) From: raymanowen
76g would have been quite a roast for my FR - a little hard to tame, with
agitation retarded at the start.
The Ethiopians like to do the Paisley Roast for me, but in my normal HG/DB
or BM mode, that just indicates, "reduce heat slightly and Press On."
What does it mean? These beans may have spent a greater proportion of time
in contact with the cool glass wall during agitation, but that's unlikely. I
don't know. There's no way to force every bean to absorb the exact same heat
profile, especially when their relative size is so large compared to the 4K
drum environment.
Cheers, Mabuhay -RayO, aka Opa!
Got Grinder?
Homeroast mailing list
Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20

4) From: Allon Stern
On Mar 9, 2009, at 7:46 PM, raymanowen wrote:
<Snip>
The IR can do significantly more than the FR. 150G is the max stated  
capacity, and is not unreasonable.
<Snip>
If the beans didn't agitate properly, there could be a very uneven  
roast - I've had that happen with peaberry, which you state yours  
was. When this happens, it may help to jiggle the iRoast to get the  
beans to move more fluidly until they expand enough that they move on  
their own.
If the few really light beans feel lighter in weight, maybe they're  
quakers.http://www.sweetmarias.com/tiny_joy_html/tinyjoy-janfeb08.pdf-
allon
Homeroast mailing list
Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20

5) From: msmb
Thanks to everyone who responded on the uneven roasts. 76g is about 1/2 cup.
I have had success using up to a whole cup but as my IR roasts hot I have
found that the 76g is what most consistently works best for me.  I have
noticed that there was not a lot of agitation with the peaberry and I did
think of shaking the roaster just slightly but thought that it would set it
off into its cooling phase. But I will give it a try.  Probably they are not
of a sufficient size to catch the blowing air enough to move them a lot. 
The very light ones are indeed a very light tan both inside and out.  I
don't think they have come to first crack.  But if this continues I am going
to collect them and try re-roasting.  Some time ago there was a discussion
of the possibility of re-roasting.  I don't see why not; isn't decaf
re-roasted, in a sense?  Then, if they get dark, I am going to try adding
them back into my grind at a rate of about 1 or 2% and see if I notice a
difference.  The economy is such that one must be very efficient.

6) From: raymanowen
"If the few really light beans feel lighter in weight, maybe they're quakers
"
With a Heat Gun above the beans and no place to go to escape the heat, the
lighter quicker quakers have to stay in Hell's Kitchen with the other guys.
Cheers, Mabuhay -RayO, aka Opa!
If we'd known you were coming, we'd have faked a quake - - Clark Air Base,
PI  1968
Homeroast mailing list
Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20


HomeRoast Digest