I'm not sure if this is the same phenomenon others have discussed in this thread, but tonight I opened a newly purchased bottle of Elmer T. Lee. I poured a glass and held it up to the light and immediately noticed there was a precipitate in it, like pulp in orange juice. I then held the bottle up to the light and noticed this material was floating around in the bourbon, and thus did not come from my glass. Is this "flock"? Can flock form in an unopened bottle of bourbon (or can it form in a few minutes after opening)? Has anyone else seen this with new bottles of bourbon? I wondered if some of the material could have come from the cork, but the cork looked intact upon inspection. Anyway, I hated to waste good bourbon, so I drank it anyway, and it was quite good.