Do they?
I was under the impression that nanobrain was suggesting such but I didn't realise it was a popular belief.
I don't completely disregard the idea, it doesn't match my experience but new information seldom does. I do believe that aluminium foil doesn't necessarily cause problems but perhaps if it is a popular belief there is something to it..?
Perhaps left exposed to air the alfoil oxidises and that promotes degredation of the lsd quicker than the air alone? Just an idea I pulled out of my butt on the spot, I wouldn't put any weight behind it.
I've read of concerns with condensation inside foil but I can't imagine that would be a problem with tightly wrapped foil, could it?
nanobrain if you're reading this could you clarify your statement? I've seen from your posts you have a lot of experience with this compound, if you know something we don't it'd be great to have it shared.