I just finished my first AG attempt and everything (most everything) went OK except the hot water wasn't high enough and I had to lift 5 gallons of 170° water over my head. Anyway, when I got to the boil, there were lots of light colored particles in the wort. As the boil progressed, they seemed to coagulate some. I've never seen this in extract boils. Is this some kind of protein thing or something? Just don't tell me the beer is junk.