The metallic taste is part of the effect, not the actual taste of the blotter.
For sure there is a lot of Nbome going around lately, and TLC can help to prevent misidentification.
But in the everyday life it is not really practical, I would do TLC if I buy a whole batch, but not if somebody shares a drop or blotter with me in a party.
Anyway, I would really like to understand the methodology and theory behind "proper LSD".
You can always hear people saying that this or that batch is really excellent in comparison to another one, and, even if in most cases this seems only wishful thinking, when it comes to really experienced users and their exposure, I could imagine that there is something to it.
I am sure that LSD is not the same thing like "a cube is a cube is a cube" and that proper synthesis and purification can make a whole lot of a difference.
What about the lysergic prodrugs?
I never tried them consciously, are there any qualitative differences to "street acid"?
What about ALD? I heard a story that the actual "orange sunshine" from Nick Sand was ALD, which would explain the huge difference in the experience it can provide.
Edit: I checked this briefly. Here is what Tim Scully says:
"The Orange Sunshine we delivered was LSD 25. ALD 52 was an ill-advised desperate defense strategy that failed miserably... The story of Orange Sunshine is complicated by the fact that The Brotherhood distributed LSD from more than one manufacturer as Orange Sunshine. "Nick and I made the original Orange Sunshine in Windsor. That was the last lab I worked in making LSD. Ron Stark managed several LSD labs in Europe and most of his output was tableted and sold as Orange Sunshine. At least some of the LSD that his labs made was not pure."[9]
Apparently ALD 52 comes with less body tension according to some reports in Shulgins TIHKAL.