So I am fermenting porter and on the second day it appears more green or brown than black. I'm wondering if this is normal and the color will change as time goes on. Also, I did a blow off but at the top of the carboy there is a thick green or brown film. I'm wondering if this is just from the foam. It is the same residue that made its way into the blow off tube. I say brown or green because I am color blind and they both look the same. Any help would be great. Thanks.