I have the same issue but on the outside, I really think it's residual wort from the mash. Hey as long as your beer is delicious than no worries
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Just brewed this from original recipe, this is my AG but I'm not new to the craft. I ended with 6 gallon w/ a SG of 1.050. The color and aroma are just Awsome. I think My sparge was off. My first running captured 3.5 gal of wort and tested with Iodine for full conversion, we will see. Super...