Author Topic: Not converting??  (Read 1678 times)

Offline bierview

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Not converting??
« on: March 21, 2016, 12:42:12 PM »
Middle of my mash  7* Vienna, 3* Flaked corn, 1* L. Munich.  After 60 minutes at 150 degrees and 10 minutes at 168 degrees, still coming up black on the iodine test.  Tasted wort and it's sweet.  Any quick opinions.  Gotta move forward on this.

Thanks

Offline Wort-H.O.G.

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Re: Not converting??
« Reply #1 on: March 21, 2016, 01:01:30 PM »
Middle of my mash  7* Vienna, 3* Flaked corn, 1* L. Munich.  After 60 minutes at 150 degrees and 10 minutes at 168 degrees, still coming up black on the iodine test.  Tasted wort and it's sweet.  Any quick opinions.  Gotta move forward on this.

Thanks

take hydrometer or refractometer reading and see if you are on target...likely all is well assuming you thermometer isn't way off.
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Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
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O'Fest

Offline euge

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Re: Not converting??
« Reply #2 on: March 21, 2016, 01:06:50 PM »
Is that test even 100% accurate/reliable?

Likely that the mash converted.
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

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Offline bierview

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Re: Not converting??
« Reply #3 on: March 21, 2016, 01:18:04 PM »
I'm sparging and will check my mash efficiency.  Thing is........I've never experienced this before.

Thanks for the encouraging words.

BV

Offline Wort-H.O.G.

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Re: Not converting??
« Reply #4 on: March 21, 2016, 01:21:09 PM »
Is that test even 100% accurate/reliable?

Likely that the mash converted.

no idea. i've never done one.
Ken- Chagrin Falls, OH
CPT, U.S.Army
https://www.facebook.com/pages/Harveys-Brewhaus/405092862905115

http://braukaiser.com/wiki/index.php?title=The_Science_of_Mashing

Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
Ger Pils
O'Fest

Offline euge

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Re: Not converting??
« Reply #5 on: March 21, 2016, 01:23:13 PM »
The corn is 37.5% of the bill. That shouldn't have been too much for the Vienna and Munich to convert. Pushing it perhaps. If anything, next time mash longer?

And what was your water-grain ratio?
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Laws are spider-webs, which catch the little flies, but cannot hold the big ones. -Anacharsis

Offline bierview

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Re: Not converting??
« Reply #6 on: March 21, 2016, 01:46:24 PM »
Water to grain ratio.........1.35 per pound

Offline bierview

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Re: Not converting??
« Reply #7 on: March 21, 2016, 01:47:19 PM »
1.35 qts.

Offline euge

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Re: Not converting??
« Reply #8 on: March 21, 2016, 01:52:52 PM »
That's not out of the realm of acceptable ratio but it *Might* have affected the adjunct mash. A lot of us shoot for a thinner mash in the 1.6-2.0 quarts range.
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Laws are spider-webs, which catch the little flies, but cannot hold the big ones. -Anacharsis

Offline Stevie

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Not converting??
« Reply #9 on: March 21, 2016, 01:56:31 PM »
Iodine tests are basic chemistry and very reliable. If your mash is well mixed and there is starch, the iodine turns black. That said I don't use them.

Too many adjuncts for the diastatic power of the Vienna. Vienna is only 50°L and most sources say 40°L is the minimum required for self conversion. That means it could barely handle its own starches before you threw 28% flaked corn in the mix.
« Last Edit: March 21, 2016, 01:59:23 PM by Stevie »

Offline coolman26

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Re: Not converting??
« Reply #10 on: March 21, 2016, 02:10:58 PM »
Agree with Stevie +1


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Offline euge

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Re: Not converting??
« Reply #11 on: March 21, 2016, 02:19:11 PM »
Ya I didn't add the corn to the bill before calculating the percentage. It's only a little better at 27%. My bad.

What sort of beer is this supposed to be? A cream ale or classic american pils? That is a lot of corn.
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Laws are spider-webs, which catch the little flies, but cannot hold the big ones. -Anacharsis

Offline dmtaylor

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Re: Not converting??
« Reply #12 on: March 21, 2016, 02:23:51 PM »
Just because you still have a little starch in there doesn't mean conversion isn't "good enough".  Your beer will most likely turn out fine.

As for reasons why, could be just that the Vienna and Munich base malts have fewer enzymes due to the darker kilning process.  If you had used a pound of Pilsner malt as well then we might not be having any discussion.  But like I say, regardless, I think it's going to turn out fine, probably, assuming your mash thermometer is accurate.
Dave

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Offline kramerog

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Re: Not converting??
« Reply #13 on: March 21, 2016, 02:25:12 PM »
Iodine tests are basic chemistry and very reliable. If your mash is well mixed and there is starch, the iodine turns black. That said I don't use them.

Too many adjuncts for the diastatic power of the Vienna. Vienna is only 50°L and most sources say 40°L is the minimum required for self conversion. That means it could barely handle its own starches before you threw 28% flaked corn in the mix.

MFB Vienna exceeds 100°L, but I agree that the diastatic power of the Vienna used is the first suspect.

Offline bierview

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Re: Not converting??
« Reply #14 on: March 21, 2016, 02:46:05 PM »
Well........lesson learned.  But I did run this grain bill by the group last week and no one said don't do it.  The only advice was to use a fair amount of hops to balance the Vienna.  What can I expect to happen in the fermenter?