Oily Coffee Beans

For non-TMC members to ask questions and offer comments

Moderators: CakeBoy, GreenBean, Gouezeri, bruceb

Oily Coffee Beans

Postby GUEST » Fri Aug 25, 2006 12:49 pm

Hi,

I purchased a box of coffee beans from Italy and had them sent over last month. Upon opening the bags, all the beans have an oily look to them, which also makes the coffee take a little bitter.

Can anybody explain why they are like this, or if it is an actual trate of certain coffees. Also is that the cause of the bitterness?

Thanks

John
GUEST
 

Postby Davec » Fri Aug 25, 2006 2:17 pm

Some beans produce more oil than others, but when you roast, as the roast progresses darker, more oils come to the surface of the bean. I tend to find if you roast hotter it also has a tendencey to drive oils from the bean more readily for the level of roast?

The Italians seem to like their coffee very dark, so you will taste more of the "roast" and less of the bean, hence the bitterness.
User avatar
Davec
 
Posts: 1072
Joined: Thu Sep 15, 2005 7:28 am
Location: UK

Postby Guest » Tue Aug 29, 2006 7:48 am

Thanks DaveC...

Are these type of beans common in the UK market, and if so, what particular brands are these? I am a coffeeholic and will drink most types of coffee, but my friends are moaning, so I want to try and avoid these roasters.
Guest
 

Postby bruceb » Tue Aug 29, 2006 8:22 am

Hello Guest,

Are the beans really oily or do they just look shiny? Do your fingers get oily when you touch them? Are the beans themselves very dark, almost charred looking? Oiliness in itself is not necessarily a defect. Are these from a small roaster or are they a brand name product?

In any case, the oil in itself is not the cause of the bitterness nor is it a necessarily a trait of a particular bean. As Davec said, the oil is driven out of the bean by high heat and/or long roasting, ie. a dark roast. However, the darker the roast the more bitterness appears. Just like burnt foods (sugar for instance) become bitter, coffee beans become more bitter when they are roasted very darkly. So the oil may not be the cause of the bitterness, but it does indicate a darker roast, which may be more bitter.

You have not told us how you are using the beans. They sound like a typical Italian "espresso" dark roast. Are you using them to make espresso? If you are, you may need to look into grinding, water temperature, pressure, extraction times, etc. Some coffees are more sensitive to extraction anomalies.

If you are doing something else with them such as making filter coffee or using them in a French press they may just not be suitable and you will either need to drink them yourself, give them away, sell or bin them.

One characteristic of oily beans is that they go rancid more quickly than non-oily beans.

I'm not familiar with the UK market, but certain chain espresso outlets are infamous for their "burnt beans," and French coffees are notably dark and most people find them bitter. I do know, however, that there are excellent sources of good, fresh-roasted beans in the UK.

Perhaps you need to tell us a bit more about the color of these beans and how you are using them.

Good luck.
Three Francesconi (CMA) espresso machines - Rossi, San Marco, LaCimbali, Faema and 2 Mazzer Major grinders- CoffeeTech Maggionlino, Hottop, Alpenröst and HW Precision roasters.
I decided I needed a bit of a change so I roasted some Monsooned Malabar. That was a change!
Image
User avatar
bruceb
 
Posts: 5363
Joined: Sun Apr 04, 2004 12:49 pm
Location: Northern Hesse, Germany

Postby lukas » Tue Aug 29, 2006 9:24 am

I fully second what Bruce had to say.

bruceb wrote:I do know, however, that there are excellent sources of good, fresh-roasted beans in the UK.


But Bruce, how come you know that? :lol:
Lukas

This week I like my coffee luke-warm.
--
Newest kit: Ghibli R-15
User avatar
lukas
 
Posts: 2797
Joined: Mon Jul 25, 2005 8:41 pm
Location: Porta Westfalica, Germany

Postby bruceb » Tue Aug 29, 2006 9:44 am

lukas wrote:I fully second what Bruce had to say.

bruceb wrote:I do know, however, that there are excellent sources of good, fresh-roasted beans in the UK.


But Bruce, how come you know that? :lol:


A little bird told me so.
Image
Three Francesconi (CMA) espresso machines - Rossi, San Marco, LaCimbali, Faema and 2 Mazzer Major grinders- CoffeeTech Maggionlino, Hottop, Alpenröst and HW Precision roasters.
I decided I needed a bit of a change so I roasted some Monsooned Malabar. That was a change!
Image
User avatar
bruceb
 
Posts: 5363
Joined: Sun Apr 04, 2004 12:49 pm
Location: Northern Hesse, Germany

Postby Guest » Tue Aug 29, 2006 11:30 am

THANKS FOR ALL THE HELP!

They are a brand bean from Italy called Saquella. You are right, they are not actually oily, they just look it. I am sampling them for maybe using in my coffee shop selling espresso based drinks. Can this type of bean effect my equipment in the long run?

Thanks Again
Guest
 

Postby HughF » Tue Aug 29, 2006 12:28 pm

Anonymous wrote:THANKS FOR ALL THE HELP!

>snip<Can this type of bean effect my equipment in the long run?

It's more likely to affect your customers if it's not giving them the taste they expect. If this happens, the problem is that VERY few will complain (even people on this Web site don't always complain!), they'll just quietly find other coffee shops.
If the beans were actually oily, they might clog grinders a little more often but if they're just shiny you should be OK. Some grinders cope very well with oily beans though.

Cheers,

Hugh
Grinders : Macap MXK conical for espresso, Mahlkoenig Vario for Chemex, Macap MC6 (spare when our office was closed) for cafetiere, Zassenhaus Knee Mill for cafetiere when working away from home.
La Spaziale Vivaldi S1 espresso machine. HotTop KN8828P roaster. Chemex manual drip for most brewed coffee plus cafetieres and eSantos.
User avatar
HughF
 
Posts: 1113
Joined: Thu Sep 25, 2003 10:47 pm
Location: Hampshire, UK

Postby CakeBoy » Tue Aug 29, 2006 6:08 pm

Hugh is so right. People vote with their feet and it is hard to get them back once they have gone.
www.CakeBoy.co.uk
International muffin blagger

Iberital L'Anna 1 Gp Hand-Fill | Wega Orion 2 Gp | Bezzera 1 Gp | Rancilio Audrey PID | Spidem Trevi
Iberital MC2 Timed | Macap M4 DS & MXA DS | Mazzer SJ | Starbucks Barista Grinder (Dualit E60/Solis 166)
Pinhalense 2x500g Gas Batch/Sample Roaster | Gene Cafe | IMEX CR-100
Aerobie | eSantos | Zassenhaus | Bodum P/Over | Chemex | Hario Woodneck | Timer Filter
User avatar
CakeBoy
 
Posts: 9964
Joined: Tue Oct 18, 2005 10:43 pm
Location: Oxfordshire, England


Return to Open House

Who is online

Users browsing this forum: No registered users and 3 guests