I brewed my first all-grain batch three weeks ago and it has been sitting in the primary fermenter ever since. I hadn't opened the fermenter for a good week and when I checked today there was a white, waxy looking film floating on top. I first thought was that it was an infection but I sampled the beer and it tastes OK (very good actually). I racked the beer off to my other fermenter hoping to leave the substance behind but most of it mixed back into the beer even with the relatively minor disturbance of inserting the racking cane. Does anyone have any idea what this is? A benign infection? Dead yeast cells? Some sort of hop or grain residue?
The picture below is poor quality and was taken after I had disturbed the beer a little so the substance looks quite broken up lumpy, it was initially a very thin film covering most of the surface uniformly.
Thanks
