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5

According to this HomeBrewTalk wiki article on MBT and this Khymos article on "lightstruck flavor", skunking occurs when isohumulone reacts with riboflavin and ultraviolet light to create MBT. The HBT wiki article suggests riboflavin is present in wort, but it is also created by yeast; the amounts in wort and beer are unknown to me. I'd guess that ...


4

MBT (more often referred to as skunking or light-struck) is an off-putting flavor and aroma characteristic that is intuitively named after the animal which is well known for dispensing what is considered to be the Satan's post-apocalyptic butthole of all off-flavors. The chemical composition and odor of MBT (3-methyl-2-butene-1-thiol) is very similar to ...


3

The smell is hard to describe, especially to someone who grew up where there are no skunks. It is not really useful for me to tell you it smells like skunk musk. I have heard some of those people describe it as the smell of burnt rubber, body odor combined with burnt popcorn, sour coffee, or certain strains of aromatic marijuana. You really have to try it ...


2

MBT (3-methyl-2-butene-1-thiol) happens real quick. People have reported Heineken bottles skunking when in direct sunlight in less than 15 minutes. Heineken has a minor defense of green tinted bottles, clear obviously has less. An hour in an ice bucket outside would most certainly skunk any beer in a green or clear bottle. Since MBT is caused primarily ...


1

You're absolutely right that tannins (a kind of polyphenol) are anti-oxidative and that increased levels in finished have been linked to a lower degree of beer staling (in this paper, for example). I've never heard the claim of their anti-UV-light effects though, so I won't touch on that. It's a tricky question because there will always be a trade-off ...


1

I store my bottles in the closet, and then move them to the fridge when I'm ready to chill them for drinking. I salvaged several green Becks bottles that I use for bottling, and of course, I've never had any issues. I do feel weird when I get stuck bottling a dark beer into the green bottles, but that's obviously just a mental thing. To answer your ...


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