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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Conversion time at 150 degrees?
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Old 12-17-2009, 01:40 AM   #11
JKoravos
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Originally Posted by XXguy View Post
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.


How'd you know you had to wait longer? Did you have another method to determine the level of conversion? You can't know if it's a false positive if that's the only method you have.
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Old 12-17-2009, 02:02 AM   #12
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I don't know how to explain it better than just point to braukaiser.com. Any time I have followed his steps, I've been able to see where I'm at with the conversion & have been able to get a good idea what's happening.

http://www.braukaiser.com/wiki/index...le=Starch_Test

I don't disagree with the average times given, but I guess I'm thinking if you're out of the ballpark, you can let it rest for 2 hours & still not get good conversion. I'd rather test it.
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Old 12-17-2009, 02:15 AM   #13
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DoubleX, nice link. Like they say a picture is worth a thousand blah blah blah
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Old 12-17-2009, 06:36 PM   #14
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Quote:
Originally Posted by XXguy View Post
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
It's entirely possible to get particles in your sample that will give you a false reading. Based on the gravity readings I get, I know I'm converting without an iodine test.
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