"Tinny"/ "Metallic" flavor?

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Postby Jnanderson » Mon Jul 30, 2012 11:05 am

Sometimes when cupping a "Tinny"/ "Metallic" flavor is evident. There are times when it is spread throughout the entire 5 cup sample and others when I can only find it in a sigle cup.

Is this flavor linked to a specific processing defect? Or, is it more likely that it is something that is happening in my lab?
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Postby chris7wade » Tue Jul 31, 2012 12:11 pm

Some coffees have a metallic flavor, I find copper or tin in some Central coffees that I use as blenders. It can also be caused by an unclean flame or having an overheated drum. Overly hot metal will cause some off flavors. The flame if it is somewhat orange can cause un even heating of the drum. This is more difficult to fix and sometimes will need to have your local gas utility check on the purity of your gas coming into your building.

Other causes could be over fertilization on the farm level. If too much fertilizer is added it can cause metallic of chemical flavors.
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