Kegconnection Complete Starter Kit and More Giveaway!


Home Brew Forums > Home Brewing Beer > General Beer Discussion > Make sure you stir well...

Reply
 
LinkBack Thread Tools
Old 09-29-2012, 04:52 AM   #1
Desp
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2012
Location: Denton, Texas
Posts: 61
Liked 1 Times on 1 Posts
Likes Given: 1

Default Make sure you stir well...

So today I came to a realization. Topping off your wort with water, putting the lid on and then shaking vigorously back and forth for 20 seconds, stopping, removing your finger from the airlock hole in the lid and resting, and then repeating the same process another 3 times DOES NOT STIR THE WORT!

I thought for sure aerating it like that would properly stir it, as it was very vigorous, but apparently not.

After brewing a barley wine tonight, and mixing it as previously described, I took a gravity reading by slowly lowering a measuring cup into the top of the wort. I poured that sample into my test tube and took the reading... 1.070... IMPOSSIBLE! The recipe predicted it at 1.094, since this was a mini mash even with NO conversion of the grains it still should have been 1.084, plus I added some extra dextrose. I concluded two possibilities... Either I added WAY to much extra water... or it's not mixed properly, that's the only possibility. Checked the total volume of wort and it was SLIGHTLY above where it should have been...

Sanitized my spoon and VIGOROUSLY mixed the wort in a circular motion, shook it some more, took another reading... 1.102, quite a difference. Bummer.. How many batches that I've brewed, but only shaking and splashing back and forth haven't been properly mixed... all of them?

Well, now I know. I think I'll get one of those motor mixing spoons for my drill and give that a go next time.

__________________
Desp is offline
 
Reply With Quote Quick reply to this message
Old 09-29-2012, 05:00 AM   #2
stratslinger
Brewing Thespian
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
stratslinger's Avatar
Recipes 
 
Join Date: Dec 2010
Location: Terryville, CT
Posts: 1,838
Liked 107 Times on 93 Posts
Likes Given: 82

Default

I wouldn't worry too much about it - sure, your OG reading might be off by a bit, but that's about all your trouble. Once fermentation kicks off, everything gets mixed up just fine.

__________________
stratslinger is offline
justin2001fox Likes This 
Reply With Quote Quick reply to this message
Old 09-29-2012, 05:06 AM   #3
Desp
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2012
Location: Denton, Texas
Posts: 61
Liked 1 Times on 1 Posts
Likes Given: 1

Default

Quote:
Originally Posted by stratslinger View Post
I wouldn't worry too much about it - sure, your OG reading might be off by a bit, but that's about all your trouble. Once fermentation kicks off, everything gets mixed up just fine.
That's kind of what I figured, the fermentation process would probably still take care of mixing it up the rest of the way and eating all of the sugars, but I like to know what I'm working with, and maybe a few of my brews that had real low O.G. readings but still seemed really strong just weren't mixed properly and the reading was off.

I was just surprised that shaking it that hard didn't actually mix it, considering how much foam was at the top of the bucket and everything, yet somehow it wasn't mixed.
__________________
Desp is offline
 
Reply With Quote Quick reply to this message
Old 09-29-2012, 05:15 AM   #4
organicrust
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2012
Location: Gainesville, Florida
Posts: 30
Liked 6 Times on 2 Posts

Default

What you have described is a real problem in analytical science. Half of the battle sometimes is getting a sample that is representative of the whole.

While it may be surprising to learn, two liquids of different density can be quite reluctant to mixing. This even occurs in natural bodies of water (ie the meeting of two rivers or brine pooling in ocean trenches). People assume that it takes special care to "layer" liquids (like in those fancy bar shots), but that is not always the case.

Diffusion is not sufficient to ensure the complete mixing of two fluids of differing density. It is simply too slow.

You should always stir thoroughly before drawing a hygrometer sample, regardless of whether you believe there exists a gradient or not. Otherwise, you are flying blind and your measurements are suspect.

__________________
organicrust is offline
 
Reply With Quote Quick reply to this message
Old 09-29-2012, 05:35 AM   #5
kylevester
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2012
Location: Lafayette, IN
Posts: 226
Liked 14 Times on 12 Posts
Likes Given: 7

Default

Quote:
Originally Posted by Desp View Post
So today I came to a realization. Topping off your wort with water, putting the lid on and then shaking vigorously back and forth for 20 seconds, stopping, removing your finger from the airlock hole in the lid and resting, and then repeating the same process another 3 times DOES NOT STIR THE WORT!

I thought for sure aerating it like that would properly stir it, as it was very vigorous, but apparently not.

After brewing a barley wine tonight, and mixing it as previously described, I took a gravity reading by slowly lowering a measuring cup into the top of the wort. I poured that sample into my test tube and took the reading... 1.070... IMPOSSIBLE! The recipe predicted it at 1.094, since this was a mini mash even with NO conversion of the grains it still should have been 1.084, plus I added some extra dextrose. I concluded two possibilities... Either I added WAY to much extra water... or it's not mixed properly, that's the only possibility. Checked the total volume of wort and it was SLIGHTLY above where it should have been...

Sanitized my spoon and VIGOROUSLY mixed the wort in a circular motion, shook it some more, took another reading... 1.102, quite a difference. Bummer.. How many batches that I've brewed, but only shaking and splashing back and forth haven't been properly mixed... all of them?

Well, now I know. I think I'll get one of those motor mixing spoons for my drill and give that a go next time.
Yeah, a mixer on a variable speed drill. *drool*

I just need to get around to it. I could cool my wort in 10 minutes or less with it, but I never remember to actually buy it. Plus, in those situations where I boil off too much wort I'd be able to stir it so much easier.
__________________
kylevester is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Something to stir with? gratefuldavis General Beer Discussion 5 07-11-2012 03:16 PM
Disappearing stir bar Nick4228 General Beer Discussion 1 02-18-2012 02:34 AM
Fruit Beer: To Stir or Not to Stir JonBoy47 General Beer Discussion 6 08-23-2011 05:50 PM
to stir or not Mayhew General Beer Discussion 4 09-11-2010 07:03 PM
Stir bars beesy General Beer Discussion 1 09-12-2008 03:54 AM