Posted Fri Feb 23, 2007, 4:57pm Subject: Uneven roasts
I've recently had some uneven roasts with beans that I wouldn't expect an uneven roast. Mexico Organic Nayarit Terruno and Guatemala Quiche La Perla Estate. The first I thought may have been due to ambient temperature as it was quite cool last weekend, but the Guatemalan I roasted last evening and it was in the upper 50s lower 60s outside warmer in the garage. I've been getting a myriad of beans between City to Full City+ when I stop the roast. I'm roasting 50- 60 grams per batch and cooling down with the collander shuffle. Is this something inherant to the bean, or a sign the $10 I paid for the popper may be nearing it's max? The cup tastes fine, I've just gotten accustomed to the Latin American beans having a more uniform appearnce. This is not the first uneven roast, but the ones before were due I think to overloading the popper. When you're down to the last 75 grams in the bag, I didn't know what else to do, but try to roast it all at one time....had to stir for about 3 minutes lol. Anyhow, thoughts anyone? Thanks
wushoes Senior Member Joined: 9 Feb 2006 Posts: 318 Location: Melbourne, Australia Expertise: Pro Barista
Espresso: La Marzocco Mistral and FB80 Grinder: Compak K10 WBC, Robur Vac Pot: Hario and Yama Roaster: Donnie Lee
Posted Fri Feb 23, 2007, 9:29pm Subject: Re: Uneven roasts
Some beans roast unevenly such as Sumatra Mandheling. When a bean like Mandheling is roasted, its appearance is blotchy. Some look scorched, some look under-roasted and everything in between. 50 to 60 grams in a popper is not a large quantity is it? Barely enough for 2 to 3 cups of coffee.
Perhaps these two beans you have roasted are uneven roasters
Posted Sat Feb 24, 2007, 4:21am Subject: Re: Uneven roasts
Yes, I've come to expect some uneven roast in Indonesian and African coffees. 50-60grams is roughly half a cup, and seems to be a good amount for the popper. Much more, and I'm doing a lot of stirring. I just didn't know if some Central and South American coffees can result in uneven roasts, as well.
turbo_tiger Senior Member Joined: 26 Jan 2007 Posts: 31 Location: Portland Expertise: Pro Roaster
Posted Sat Feb 24, 2007, 7:15pm Subject: Re: Uneven roasts
I do not roast at home so I might be out of place. I do roast professionally and have roasted the Mexico Terruno Nayarit quite a few times so I have some knowlege to share. I have never had a really uneven roast of the Mexican, nothing comparable to say a Mandheling. I have however had some slight uneveness just after first crack, but again not very apparent.
I hope this can help at all.
How come there is no non-home roasting forum? Or can I post stuff that I have on here?
Dooglas Senior Member Joined: 12 Mar 2005 Posts: 662 Location: Portland, OR Expertise: I love coffee
Espresso: Expobar HX, La Pavoni lever Grinder: Ascaso, Solis Drip: Bonavita, Bodum press Roaster: GeneCafe, Behmor
Posted Sun Feb 25, 2007, 11:26am Subject: Re: Uneven roasts
I have roasted quite a bit of Malinal and Nayarit Terruno myself. These high elevation shade grown coffees from western Mexico are the absolute soul of consistency. It is with dry processed coffees such as Ethiopians that I see uneven roasts. I would suspect other equipment or technique issues.
"Sadness is just another word for not enough coffee" - Scott Adams (Dilbert)
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