According to a label filed with the Alcohol and Tobacco Tax and Trade Bureau (TTB), Prairie Artisan Ales is working on releasing Unfadable, a sour ale aged in foeders with raspberries and packaged in 500ml bottles.

Although the beer label used in this story is the label that was approved by TTB, Prairie frequently changes the final designs of labels before the beers are released to market.

An email sent to the brewery for additional information was not immediately returned.