I have the following problem.
We are brewing lagers using european malt and brewing single decoction. I have found that the originaly negative iodine reaction turns to positive as sparging continuos. The finall mash temp is 165 F, the same is the sparging water. First wort and at the beginning of sparging the iodine is negative , but as the sparging progreses it turns to be positive and it gets worse and worse till the end of sparging. Run off is clear, saprging water temp is correct. I think the problem could be the milling, but I am not sure at all. Because our mill has damaged grooves on the rollers, there are always some whole garins and big chunks in the grist, and it can't be fixed by gap adjustment. I think that the starch from these particles could be dissolved slowly during sparging, and since the temperature in kettle is at the and of sparging higher than 172 F, it can't be converted by the wort enzymes in kettle. Does anyone has any experience with that? And also do you know what colour gives betaglucans with iodine?
Thanks a lot for any
We are brewing lagers using european malt and brewing single decoction. I have found that the originaly negative iodine reaction turns to positive as sparging continuos. The finall mash temp is 165 F, the same is the sparging water. First wort and at the beginning of sparging the iodine is negative , but as the sparging progreses it turns to be positive and it gets worse and worse till the end of sparging. Run off is clear, saprging water temp is correct. I think the problem could be the milling, but I am not sure at all. Because our mill has damaged grooves on the rollers, there are always some whole garins and big chunks in the grist, and it can't be fixed by gap adjustment. I think that the starch from these particles could be dissolved slowly during sparging, and since the temperature in kettle is at the and of sparging higher than 172 F, it can't be converted by the wort enzymes in kettle. Does anyone has any experience with that? And also do you know what colour gives betaglucans with iodine?
Thanks a lot for any
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