Originally Posted by Almighty
dantheman - That is pretty strange. There is usually a slight difference in color just based on yeast flocculation, but that is extreme. I have never seen anything like that. I do know the more oxidation the darker the color. And it looks like you have a dry airlock there. So oxidation could be the reason for the color difference, I just didn't think it would be that extreme. You can confirm if you have oxidation by tasting - any acetic acid (vinegar)?
Thanks, Almighty. The airlock wasn't totally dry, there was still a seal on it. I left out a potentially important detail in the video. I inoculated this one with dregs from a Cascade Kriek bottle, but it didn't have any activity for a good month. I decided to put some US05 in there, which caused an explosion of a fermentation... which I forgot to check on and made that mess in the airlock. It's been sitting like that for about 5 months.
I suppose oxidation is possible, but I don't think that it is the cause. I haven't been brave enough to taste yet, but I suppose that will be something to do for next Homebrew Wednesday! I will definitely report back the tasting results in hopes you or someone else has an idea what caused this darkening.
Thanks again, Almighty, I really appreciate your responses here.