Obviously there is too much to disagree about here, but I'm sorry, there is definitely a degradation that occurs in LSD during storage... and anyone who's ever had vials and vials of the pure stuff knows that after months go by, the trip changes. It's not set and setting! It's actual physical effects and feelings that are there that weren't there when the vial was fresh out of the lab.
What's more is that throughout ALL of the 200 or so vials that I've gone through in my life, this is a cycle that ALWAYS happened. You get a fresh vial, its amazingly pure and clean, no ill physical effects from it, so easy to forget that you took any acid at all (as far as body feelings go). But then if that same vial happened to still be around after 6 months or so, the very same acid which still allowed me to trip, would start giving me the physical feelings that I've come to associate over the years with "bad acid" (but more accurately just "decomposing acid").
And if this were set and setting, I could write those feelings off as just that, and come back another time and it will be just like the vial is fresh, right? Then how come it NEVER works this way? In my whole entire acid-taking career, once the acid starts to decompose (I suppose that's just my theory, although Shulgin doesn't disagree with me) it stays decomposed, and the ill physical feelings are there for good. There is a definite pattern there, and anyone who's had the opportunity to go through hundreds of vials in their time should be able to see where I'm coming from.
I can't prove it, but my first-hand anecdotal experience is worth way more than the line "acid is acid." NOPE! There is pure acid, and there's acid that's not pure and causes flu-like body aches (but don't get me wrong, the trip is still there, its just affected by the decomposed drug). Whether or not the acid got this way due to normal decomp-over-time, or if it was poorly synthesized, the result is still the same.
And it gets progressively more noticeable. One time I found an old empty acid vial in my closet, that I had forgotten about. It had to have been in my closet for about a year and a half. Since I didn't have any fresh acid at the time, I figured I would cut the vial open and lick the inside of it, which I did. And let me tell you, the physical feelings I got from it were so ill-feeling, all I could do was lay on my couch the whole night watching movies. It doesn't result in a "bad trip" or anything, that's not what I'm saying. I mean mind over matter and stuff... I can always have a good time and make the best of it. I'm just saying physically it makes me feel slightly ill, where clean, fresh acid makes me feel like I didn't take a drug at all (except for that electricity taste that's always there on any amount of acid).
I'm done ranting.