Re: Fermenting in a Dark Place
Jclark is correct; the energetic ultraviolet wavelengths (even from fluorescent lighting) impact and break up the isomerized hop acids, changing them into mercaptans (yes, just like a skunk uses). The reaction can occur in minutes in strong sunlight, even over the course of drinking a pint. Lighter-colored beers are naturally more vulnerable. Brown glass blocks the implicated wavelengths, which is why brown glass is such a standard.
I don't worry about covering up mead ferments or bottles so much; but the protect-from-light routine is so much a part of my DNA that it often happens anyways.
Bees, brews and fun
in Lyons, CO