Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Conversion time at 150 degrees?
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Old 12-16-2009, 05:04 PM   #1
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Default Conversion time at 150 degrees?

How long should I mash at 150 degrees to get full conversion? 60 minutes? 90 minutes?


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Old 12-16-2009, 05:11 PM   #2
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Yes. Seriously, 60 should be plenty but grist bill and mash thickness will have an effect on it.


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Old 12-16-2009, 05:15 PM   #3
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just check for conversion with the iodine test, I think 75 would be plenty enough time though.
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Old 12-16-2009, 05:18 PM   #4
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I find the iodine test pretty much worthless since you can get false readings so easily.
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Old 12-16-2009, 05:21 PM   #5
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Quote:
Originally Posted by Denny View Post
I find the iodine test pretty much worthless since you can get false readings so easily.
ok, just wait longer then

seriously though, I have never had conversion problems with a 60M mash, I think it is just a matter and set it and forget it.
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Old 12-16-2009, 05:22 PM   #6
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Quote:
Originally Posted by humann_brewing View Post
ok, just wait longer then

seriously though, I have never had conversion problems with a 60M mash, I think it is just a matter and set it and forget it.
I'd agree with with ya, given most malts and a 150 mash temp.
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Old 12-16-2009, 05:46 PM   #7
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If you're not checking for conversion, you really don't know if it converted, no matter how long you mash. I don't quite get what is meant above by "false readings". If you still have starch, you will get a positive reaction when you do an iodine test. Anytime I've gotten a positive reaction for starch, I knew I had to wait longer.

If you want to know more - read up in this thread:
http://www.homebrewtalk.com/f36/ah-y...4/#post1721818
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Old 12-16-2009, 06:07 PM   #8
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Thanks for the info.
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Old 12-16-2009, 06:10 PM   #9
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OK...possible stupid question. If you are mashing dark grains for a stout how do you know if you converted starch to sugar with iodine? Doesn't iodine turn the liquid black if there is still starch?
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Old 12-16-2009, 06:15 PM   #10
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Conversion can happen in as little as 15min. Test it.


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