Results 1 to 15 of 15

Thread: Diagnosing blonding, channelling & other extraction issues with a naked PF

  1. #1
    Senior Member
    Join Date
    Mar 2011
    Posts
    609

    Diagnosing blonding, channelling & other extraction issues with a naked PF

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hey all,
    Theres a bit of talk here and there about diagnosis of extraction issues like early blonding and channelling, but it seems like lots of people try to describe their questions and examples. Maybe some videos would work better! I found a few on youtube which I would love your comments and thoughts on what is happening in the each extraction process, whether each pour has issues, what might be causing those issues and how to get a better extraction.
    Please take a look and put up your comments your comments or ideas for other CSers and the betterment of extractors everywhere!

    [media]http://www.youtube.com/watch?v=Sf-HL3BnEek[/media]

    In the above video, to me it looks like its a bit of a dounut start, then once it comes to one stream there are little blond "injections" that come into the stream for about a second every ~2 seconds. Is this a problem or normal and to be expected?

    [media]http://www.youtube.com/watch?v=FrRqrDzf1p4[/media]

    This has the title "problem sample" but to me it looks pretty good and even, not having blond squirts like the one above and not rushing at the end. Can anyone else see problems?

    [media]http://www.youtube.com/watch?v=NHdbHmMrr5k[/media]

    Ridiculously thick and massive cone - is this just super fresh beans? What else could cause this and is it a good thing?


    [media]http://www.youtube.com/watch?v=itc6iBeor3E[/media]

    This happens to me sometimes - it seems to have some massive thinning and rushing in the 2nd half of the pour - what causes this? Is it channelling?

    Please list your diagnoses and also some more videos for other to diagnose as well!


    Edited to properly embed videos

  2. #2
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Hello jb,

    ewetoob links and other media can be embedded. Just insert the link between image tags- replace brackets with [square brackets] though e.g: {img}link{/img}

    Cheers

    Chris

  3. #3
    Super Moderator Javaphile's Avatar
    Join Date
    Dec 2004
    Location
    Earth!
    Posts
    15,580

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    For embedding video the commands are {media}link{/media} (replacing the {}s with square [] brackets). The {img}link{/img} is for pictures, not videos.


    Java ":)" phile

  4. #4
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Quote Originally Posted by 0C273027362E2F2A23460 link=1334265057/2#2 date=1334269829
    For embedding video the commands are {media}link{/media} (replacing the {}s with square [] brackets). The {img}link{/img} is for pictures.

    Java ":)" phile
    Just goes to prove its best I have that first coffee before posting!* ::)

  5. #5
    Senior Member
    Join Date
    Mar 2011
    Posts
    609

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Thanks for the edit!
    Still keen to hear thoughts on those videos and other videos as well!

  6. #6
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    To me:

    #1 looks choked and was definitely chanelled. Donut distribution due to increased density towards the dentre of the dose.

    #2 looks pretty good.

    #3- yep very fresh and massive degas aeration.

    #4 initial pour is not too bad (looked a bit dark at the start and would be interesting to know bean age/source. The shot was just waaaaaay too long and I am not surprised blonding occurred.

    Its tricky without being able to see the shot pour into a clear cup/class. Ultimately though, only taste buds can answer the one big question ;)

  7. #7
    Senior Member GregWormald's Avatar
    Join Date
    Jul 2007
    Posts
    2,286

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    What Talk_Coffee said.

    Greg

  8. #8
    Senior Member
    Join Date
    Mar 2011
    Posts
    609

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Got another one...

    [media]http://www.youtube.com/watch?v=R5hVXOCg7WU[/media]

    Whole shot went for about 31 seconds, but at about 13 seconds in (0.23 on the video) the pour start to speed up, and by 20 seconds (0.30 on video) it looks really thin.
    Would you have cut it at 20 seconds or before? What could be reasons for this?

  9. #9
    Senior Member
    Join Date
    Sep 2011
    Posts
    395

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Quote Originally Posted by 404B474F595A484F4B59464F532A0 link=1334265057/7#7 date=1337306081
    Got another one...

    Would you have cut it at 20 seconds or before? What could be reasons for this?
    Youre still getting some channelling, The tell-tale spurt at around the 25 second point shows that.

    I might have cut it a little earlier myself, but then, Who can say if thats right or not.

  10. #10
    Senior Member C-man's Avatar
    Join Date
    Jun 2012
    Location
    Sunshine Coast, Peregian beach
    Posts
    265

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    I liked the #2 super thick one

  11. #11
    Senior Member C-man's Avatar
    Join Date
    Jun 2012
    Location
    Sunshine Coast, Peregian beach
    Posts
    265

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    talk Coffee,

    what would be the entry level machine that could pull a shot like #2?

    i realize the grinder plays a part as well.

  12. #12
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665

    Re: Diagnosing blonding, channelling & other extraction issues with a naked PF

    Quote Originally Posted by 046A2A2629470 link=1334265057/10#10 date=1340435860
    talk Coffee,

    what would be the entry level machine that could pull a shot like #2?

    i realize the grinder plays a part as well.
    hello c-man,

    Any good entry level machine can do it (appliances excluded). All thats required is a good grinder, fresh beans and most importantly sound technique.

    Chris

  13. #13
    Senior Member
    Join Date
    Feb 2012
    Location
    Central Coast NSW
    Posts
    681
    Bit of a thread revival!

    If I was putting this in milk, I would have stopped the shot 5 seconds earlier. However I have found that when I get that nice tight start to a pour, I enjoy the shot straight up a lot more if I let it run a bit longer to help balance out the bold flavours from the tight extraction.

    Thoughts?


    https://www.youtube.com/watch?v=wjVR_oDT1zU

  14. #14
    Senior Member GregWormald's Avatar
    Join Date
    Jul 2007
    Posts
    2,286
    If that's the way you like it, then it's good.

    For me, I like the ristretto length.

    Greg

  15. #15
    Junior Member
    Join Date
    May 2012
    Location
    Tamworth, New South Wales, Australia
    Posts
    10
    Behmor Brazen - $249 - Free Freight
    I like #2 but if I tried to take a photo like that, by the end of the shot you wouldn't be able to see the PF from all the spray which landed on the screen...



Similar Threads

  1. More SB 6910 Extraction Issues
    By adriaanse in forum Brewing Equipment - Midrange ($500-$1500)
    Replies: 4
    Last Post: 24th June 2010, 02:26 PM
  2. Diagnosing a shot with the naked PF?
    By NewToEspresso in forum General Coffee Related...
    Replies: 1
    Last Post: 4th February 2009, 12:40 PM
  3. Diagnosing this extraction.. does this look right?
    By benandfaith in forum General Coffee Related...
    Replies: 4
    Last Post: 25th April 2008, 01:02 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •