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Thread: do you blend before or after roasting

  1. #1
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    do you blend before or after roasting

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    there are arguments for both sides, want a solid read on what the CS society is doing and to what end.

  2. #2
    Senior Member fatboy_1999's Avatar
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    Re: do you blend before or after roasting

    I do both.
    It depends on the beans in play.
    Some simply dont work well roasting at the same time.

    Its great fun trying though!

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    Senior Member redzone121's Avatar
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    Re: do you blend before or after roasting

    Quote Originally Posted by 585F4A5C5147610F0707073E0 link=1245629509/1#1 date=1245635807
    I do both.
    It depends on the beans in play.
    Some simply dont work well roasting at the same time.
    Same, might need to add some more options to the poll.
    Sometimes post roast almost happens on its own ::)

    CB

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    Senior Member greenman's Avatar
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    Re: do you blend before or after roasting

    Im like fatboy, depending on the beans I pre-blend, I do this for some friends regularly and they love it.
    I also roast a few beans separately and then post-roast blend them, I also love the single origins, its a great learning experience just getting in there and trying different combinations, no matter what the result they still taste better than most run-of-the mill cafe coffees.

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    Senior Member GregJW's Avatar
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    Re: do you blend before or after roasting

    Mostly blend post-roast.

    Only pre-roast blends I usually do is when I have the last 100-200 gms in the bag (I wont insult them by calling them "dregs"), Ill pre- blend them, then only if theyve been rested in the same bag for a few days to equalise moisture content.

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    Re: do you blend before or after roasting

    I do both....

    Mostly for the reasons given already and if Im in the process of developing a new blend, or need to stagger roast batch times to suit beans that develop their peak flavours at very different times post roast.

    Mal.

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    Re: do you blend before or after roasting

    I to do both, sometimes I pre blend if the Beans are of similiar size and also if I just have to make up the numbers.
    Most of the time I post blend it just seems easier to me.

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    Re: do you blend before or after roasting

    I post-roast blend only - this way it enables me to bag up and cup individual SOs as well as make up experimental blends after the roasting.

    The only exception I have is when I have my end-of-year clean out of partial bags and left-over green. *These get pre-blended and roasted as a clean-skins batch :)

    Last years batch was an absolute stunner but alas, I had no idea what was in it *::)

    -A-

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    Re: do you blend before or after roasting

    I was relatively new to roasting and chose the two most opposite beans I could have for my first pre-blended roast :P. Subsequent to that great error, all have been post-roast.

    I like playing around with ratios post-roast through their development cycles.

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    Re: do you blend before or after roasting

    I do both if the beans are similar I will roast them together, once I am happy with the blend. Roasting separately give room to play with different bled shot by shot.

    Brett

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    Re: do you blend before or after roasting

    The thread topic is do you blend before or after roasting
    and the poll question is do you roast before or after blend?

    It confused me, and possibly others. So Im not sure that the poll results are valid :-[

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    Re: do you blend before or after roasting

    Ive done both pre and post roast blends, but as I only have a handful of roasts under my belt, have no strong opinion either way.

    Am currently drinking a mix of 280g columbian excelso 140g yirg pre blended and pulled just at 2nd crack starting. These were the quantities left after roasting severl batches as SO.


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    Senior Member Pavoniboy's Avatar
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    Re: do you blend before or after roasting

    I do both. My very simple determinant (absolute beginner to blending) is if all beans being blended hit first and second crack at very similar points (from previous experience of roasting them alone) and I like to pull them at the same point...then I roast them together. If the above conditions are not met, then I roast seperately and do a post blend.

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    Re: do you blend before or after roasting

    We mostly do post-roast, for the same reasons Alchemist mentioned - love to cup the SOs, even if I blend the rest of the batches immediately after roasting. And yeah, when we get 2 or 3 bags with ~200g left in them we normally do a random blend of them pre-roast... but I didnt count that ;)

    Quote Originally Posted by 3203140D0C0B000D1B620 link=1245629509/12#12 date=1254356132
    if all beans being blended hit first and second crack at very similar points (from previous experience of roasting them alone) and I like to pull them at the same point...then I roast them together.
    Very interesting... I assumed (and read) that diff beans would reach FC and SC at different times in a roast - given that they may have normal FC temps 5-10C apart. However, whenever we have done pre-roast blends, Ive only noticed a single distinct period of FC. This could be because the beans FCs run into each other and mask their different timings... but I suspect it may be something else. The beans are letting out water vapour (at different rates, probably), so I wonder if the faster-roasting beans absorb some of the water vapour from the slower-roasting beans such that they actually reach the point of First Crack at the same or a similar time...? Wild guess, I suppose, but it makes sense to me. In which case, pre-roast blending probably changes the way certain beans react to a given roast profile.

    Ok, apologies for the OTness as well as the esoteric nature of those observations!
    Cheers
    Stuart.

    EDIT: Ha ha. 300th post... and I wasted it on THAT rubbish! ;)

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    Re: do you blend before or after roasting

    When doing a pre roast blend, I make the blend up the day before and let all of the beans sit in a container together to equalize moisture content overnight, it helps to even out the roast. A Wise CS guru gave me that tip.

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    A_M
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    Re: do you blend before or after roasting

    Quote Originally Posted by 282B38382F264A0 link=1245629509/14#14 date=1254434276
    When doing a pre roast blend, I make the blend up the day before and let all of the beans sit in a container together to equalize moisture content overnight, it helps to even out the roast. *A Wise CS guru gave me that tip.
    Will give it a go... However all my beans sit in the same box and in their little CS bags... Thus over time I am ASSUMING that the moisture and temp of the beans should be some what stable and consistent...

    It is not like they have membranes with a charge and in solution, thus when settled out (in their own little group/ clump) due to their size and mass; take on like properties. The issue here is that in the body the cells are in in suspension and all mixed up; thus are in a true state of being and when testing you want their actual prperties and not GROUP THINK :o

    Interesting concept - Biological and general Behaviours often mirror each other ;D

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    Re: do you blend before or after roasting

    I have always blended post roast and never actually done a pre-roast blend. What I would like to know though is how you know what beans are similar enough to pre-blend. Anyone kean on explaning :)

    BTW this is my first post on CS after nearly 6 months of listening and learning. Love the site and got on it in June as my husband and I bought a Gene Cafe, VBM and Macap grinder :) He is now the Barista and I am the roast master of the house.

  18. #18
    A_M
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    Re: do you blend before or after roasting

    Quote Originally Posted by 3730343B3F30343B3C30550 link=1245629509/16#16 date=1259630416
    I have always blended post roast and never actually done a pre-roast blend. What I would like to know though is how you know what beans are similar enough to pre-blend. Anyone kean on explaning :)

    BTW this is my first post on CS after nearly 6 months of listening and learning. Love the site and got on it in June as my husband and I bought a Gene Cafe, VBM and Macap grinder :) He is now the Barista and I am the roast master of the house.
    You would be surprised or Not at the level of pre blending..

    For both home and Commercial... While it may be correct to cup and the post blend.. Time and space as well as storage etc often has an impact on how and why pre blending is done..

    Note: It does not mean that some post blending and or QA has not been done... But that for ongoing large runs... Pre blending can be efficient..

  19. #19
    Senior Member fatboy_1999's Avatar
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    Re: do you blend before or after roasting

    Quote Originally Posted by 4344404F4B44404F4844210 link=1245629509/16#16 date=1259630416
    I have always blended post roast and never actually done a pre-roast blend. What I would like to know though is how you know what beans are similar enough to pre-blend. Anyone kean on explaning :)

    BTW this is my first post on CS after nearly 6 months of listening and learning. Love the site and got on it in June as my husband and I bought a Gene Cafe, VBM and Macap grinder :) He is now the Barista and I am the roast master of the house.
    I suppose it comes down to this sort of thing.
    BEANA - usually hits 1st crack around 16 minutes
    BEANB - usually hits around 14 minutes.

    If you roast them together, will it mean that by the time BEANA is getting into 1st crack, BEANB is nearly ready to go into 2nd crack?

    To a degree, pre-mixing and leaving the greens to sit for a few days is meant to equalise them (as mentioned earlier), so the gap may be shortened.
    Also, temperature control during the roast can be used to equalise too if you know the beans well enough.

    Having said all that, I just use trial and error. And yes, there have been errors! I tend to try blends as post-roast first and if I think its got potential, I play around with blending them prior to the roast. Not a perfect science, but I enjoy it.

    Brett.

  20. #20
    Senior Member greenman's Avatar
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    Re: do you blend before or after roasting

    Ive been doing a pre-roast blend for friends for a couple of years and they love it. Usually 50% Brazil, 30% PNG or Indo, 20% Ethiopian, the blend varies depending on the beans I have at the time but always produces a good espresso and milk drink after 5-7 days resting. I reach first crack at 12mins and second crack around 17mins at 219-220C.
    At home I roast mainly single origins and throw them together to experience different combinations--"the joys of home roasting!!"

  21. #21
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    Re: do you blend before or after roasting

    Thanks guys. Its interesting to hear the commercial side of it and that logistics play such a big part. I have determined a really good blend recently but I have roasted them all really differently so Ill have to find a different blend to test preblending with :)



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