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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > What can cause a metallic after taste?
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Old 06-08-2009, 07:28 PM   #11
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Did you add minerals to the distilled water? While some minerals can cause off flavors like metalic tastes, you also don't want a complete lack of minerals either. If you did not add minerals, you may have some off flavors in those beers as well; that is why I suggest spring water. However, if you do have off flavors, they are not likely to be metallic. Let us know how those turn out when they come through.

I would think a Brita tap would be enough to filter out whatever the mineral is that causes metallic taste.

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Old 06-08-2009, 07:33 PM   #12
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Here is the how to brew's take on metallic off flavors

How to Brew - By John Palmer - Common Off-Flavors

Quote:
Metallic
Metallic flavors are usually caused by unprotected metals dissolving into the wort but can also be caused by the hydrolysis of lipids in poorly stored malts. Iron and aluminum can cause metallic flavors leaching into the wort during the boil. The small amount could be considered to be nutritional if it weren't for the bad taste. Nicks and cracks ceramic coated steel pots are a common cause as are high iron levels in well water. Stainless steel pots will not contribute any metallic flavors. Aluminum pots usually won't cause metallic flavors unless the brewing water is alkaline with a pH level greater than 9. Shiny new aluminum pots will sometimes turn black when boiling water due to chlorine and carbonates in the water.

The protective (grayish) oxides of aluminum can be enhanced by heating the clean pot in a dry oven at 250°F for about 6 hours.
So, unless you are using a chipped ceramic pot, which it seems like you are not, then it is most likely something in your water.
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Old 06-08-2009, 07:33 PM   #13
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Quote:
Originally Posted by cubbies View Post
Your water chemistry can cause it. Unfortunately that is the extent of my knowledge. I forget what chemical causes it, and I couldn't tell you what a high portion of that would be. I am pretty sure it is in how to brew though.
I get a slight metallic aftertaste in some of my beers that use darker malts. I'm certain it's a water chemistry issue. I'm getting a water test, but in the mean time I just keep making APAs and IPAs, etc.

Do you notice it more it a beer with darker color malts, particularly roasted malts?
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Old 06-09-2009, 12:49 AM   #14
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I was getting a bit of a metallic after taste in all my beers after I moved. Using filtered water has cleared up all the issues using the exact same equipment.

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Old 06-09-2009, 12:53 AM   #15
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I'd agree that your water is most likely the culprit.

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Old 06-09-2009, 06:06 AM   #16
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It's not just water. I'm starting to come to the conclusion that (like Yooper), the effect is most pronounced when you use dark grains/extract. The darker my wort, the more metal I usually taste.

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Old 06-09-2009, 10:23 AM   #17
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Quote:
Originally Posted by rocketman768 View Post
It's not just water. I'm starting to come to the conclusion that (like Yooper), the effect is most pronounced when you use dark grains/extract. The darker my wort, the more metal I usually taste.
The two batches that have had it have been an APA and a Scottish 60

My dark beers come out great, but I do have highly alkaline water
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Old 10-31-2012, 07:27 PM   #18
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Interesting reading here. I've experienced this too. All with 60% grain mix beers. One was a Maibock with Weyermann's Caramunich II grain. In two batches, each used the same LME as supplement but had 1 lb of the Caramunich II grain. The one that had the metallic taste had a steep temperature of 160 degrees and went higher only for the boil. The second batch I experimented with a much higher steep temperature of around 190 and each boiled for an hour. The batch that steeped around 160 had a very strong metallic flavor. The batch that steeped around 190 had no such flavor artifacts. The equipment was the same for each batch. Note here too: I use heavily filtered well water with known high iron content. The filtration system I use is by PUR.

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