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General Category => All Grain Brewing => Topic started by: dzlater on April 03, 2011, 04:55:49 PM

Title: 2.5 hour mash ?
Post by: dzlater on April 03, 2011, 04:55:49 PM
I am planning on brewing this http://barclayperkins.blogspot.com/2011/01/lets-brew-wednesday-1811-whitbread.html (http://barclayperkins.blogspot.com/2011/01/lets-brew-wednesday-1811-whitbread.html)
It calls for a 2.5 hour mash.
I am assuming this was done because of the poor malt quality of that era.
Would it really make a difference if I just mashed for my usual 1 hour?

Title: Re: 2.5 hour mash ?
Post by: euge on April 03, 2011, 05:54:05 PM
I don't see why not. If you want to stay true to the recipe then mash the full amount of time.
Title: Re: 2.5 hour mash ?
Post by: tubercle on April 03, 2011, 06:15:47 PM
The Tubercle has mashed overnight with no ill effects.
Title: Re: 2.5 hour mash ?
Post by: majorvices on April 03, 2011, 06:59:36 PM
With today's malts a 45-60 minute malt is perfectly adequate (20-30 minutes in many cases) - but a longer mash won't hurt and may increase you efficiency if you can keep the temp steady. If the temp drop lower for an extended period you could get a drier beer than intended. I don't think that enzymes get denatured very quickly at mash temps.

FWIW I mash my tripel for 90-120 minutes and get very high efficiency. Or, at least a few points higher than normal.
Title: Re: 2.5 hour mash ?
Post by: jamminbrew on April 03, 2011, 09:56:13 PM
Wouldn't a conversion test with iodine tell you whether it's done in the mash or not?
Title: Re: 2.5 hour mash ?
Post by: denny on April 03, 2011, 09:59:25 PM
Wouldn't a conversion test with iodine tell you whether it's done in the mash or not?

Maybe.  It's fairly easy to get a false reading with that test.  It also doesn't tell you how far things have gone.
Title: Re: 2.5 hour mash ?
Post by: Thirsty_Monk on April 04, 2011, 01:07:43 AM
I also do not do the iodine test.

There is a conversion table to check your mash OG.
Thinner mash lower OG.
This seams to be better then iodine test.
Title: Re: 2.5 hour mash ?
Post by: a10t2 on April 04, 2011, 01:26:31 AM
There is a conversion table to check your mash OG.
Thinner mash lower OG.
This seams to be better then iodine test.

That just tells you that you've solubilized the starches, though, not that they've been converted.
Title: Re: 2.5 hour mash ?
Post by: Thirsty_Monk on April 04, 2011, 03:22:26 AM
There is a conversion table to check your mash OG.
Thinner mash lower OG.
This seams to be better then iodine test.

That just tells you that you've solubilized the starches, though, not that they've been converted.

Not to be argumental but if I check OG with refractometer I get reading of sugar in solution.
It does not mater if I take sample from Mash tun of boil kettle.
Refractometer reads sugar and not starches.

It least that is my understanding of it.
Title: Re: 2.5 hour mash ?
Post by: a10t2 on April 04, 2011, 03:39:24 AM
Refractometer reads sugar and not starches.

I've actually checked a cornstarch solution and it does result in a reading on the refractometer.
Title: Re: 2.5 hour mash ?
Post by: johnf on April 04, 2011, 03:56:29 AM
There is a conversion table to check your mash OG.
Thinner mash lower OG.
This seams to be better then iodine test.

That just tells you that you've solubilized the starches, though, not that they've been converted.

Not to be argumental but if I check OG with refractometer I get reading of sugar in solution.
It does not mater if I take sample from Mash tun of boil kettle.
Refractometer reads sugar and not starches.

It least that is my understanding of it.

You get a reading of everything in solution with the (incorrect) assumption that it is all sucrose, assuming your refractometer is calibrated for sucrose.

Cornstarch is poorly soluble in water so I would expect the refractometer to read similarly in water and a water/corn starch suspension.
Title: Re: 2.5 hour mash ?
Post by: Thirsty_Monk on April 04, 2011, 05:47:13 PM
Interesting.
I was referring Kai's article about this matter but his site seams to be down.
Title: Re: 2.5 hour mash ?
Post by: Bret on April 04, 2011, 05:57:27 PM
The Tubercle has mashed overnight with no ill effects.

Bret has done this, too.