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Old 05-05-2006, 04:45 AM   #1
BeerRenter
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Left my copper wort chiller in a bucket of bleach solution overnight. Woke up to green tarnish all over the coper. How do I fix it?

 
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Old 05-05-2006, 05:47 AM   #2
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NOTE: That green is copper carbonate and is poisonous if ingested. You need to get all the green off this thing before putting it in your beer.

Vinegar should do the trick. Might need some elbow grease too--- use an old toothbrush.

In the future, significantly lower the amount of bleach you use for cleaning. A single overnight causing complete oxidation sounds like you used a very high concentration of bleach.
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Old 05-05-2006, 01:51 PM   #3
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What Palmer has to say:

http://www.howtobrew.com/section1/chapter2-2-2.html

Cleaning Copper
For routine cleaning of copper and other metals, percarbonate-based cleaners like PBW are the best choice. For heavily oxidized conditions, acetic acid is very effective, especially when hot. Acetic acid is available in grocery stores as white distilled vinegar at a standard concentration of 5% acetic acid by volume. It is important to use only white distilled vinegar as opposed to cider or wine vinegar because these other types may contain live acetobacteria cultures, which are the last thing you want in your beer.

Brewers who use immersion wort chillers are always surprised how bright and shiny the chiller is the first time it comes out of the wort. If the chiller wasn't bright and shiny when it went into the wort, guess where the grime and oxides ended up? Yep, in your beer. The oxides of copper are more readily dissolved by the mildly acidic wort than is the copper itself. By cleaning copper tubing with acetic acid once before the first use and rinsing with water immediately after each use, the copper will remain clean with no oxide or wort deposits that could harbor bacteria. Cleaning copper with vinegar should only occasionally be necessary.

The best sanitizer for counterflow wort chillers is Star San'. It is acidic and can be used to clean copper as well as sanitize. Star San can be left in the chiller overnight to soak-clean the inside.

Cleaning and sanitizing copper with bleach solutions is not recommended. The chlorine and hypochlorites in bleach cause oxidation and blackening of copper and brass. If the oxides come in contact with the mildly acidic wort, the oxides will quickly dissolve, possibly exposing yeast to unhealthy levels of copper during fermentation.


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I was going to post this last night but it's not as detailed as I would have liked. Try vinegar, Star San or some PBW and keep your chiller out of the bleach from now on....

 
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Old 05-05-2006, 02:01 PM   #4
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Quote:
The best sanitizer for counterflow wort chillers is Star San'. It is acidic and can be used to clean copper as well as sanitize. Star San can be left in the chiller overnight to soak-clean the inside.
ditto on that
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Old 05-05-2006, 03:47 PM   #5
BeerRenter
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I remember reading something about that in Palmer's book, but I think I was enjoying some of the fruits of my labor at the time. The information somehow gets into my head, but its fuzzy to say the least. When I saw some green on the chiller the next morning, it started coming back to me. My biggest concern was if the chiller could be revived and re-used. I've got the vinegar at home...I'll be scrubbing tonight!

 
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Old 05-05-2006, 04:33 PM   #6
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Try boiling it in vinegar, that should help reduce the amount of elbow grease needed.
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