Roughly anywhere between 5 and 25 micrograms. There's a very thin line between "i'm feeling good and i can get work done" and "that nail in the wall sure looks interesting, lets investigate its origins" as you approach the upper bound of that.
Thanks, I imagine that could be quite a hit-and-miss game to play. I can't see black-market tabs of LSD containing an even distribution of the molecule, at that scale. One day you might feel nothing, then that nail might look very interesting the day after.
That's where liquid comes in. Dissolve your tab(s) in (pure!) water (or alcohol), then divide this liquid into as many parts as you need to get to your 10 or 15 micro-grams.
But you'll learn all this when you do your own careful research, which anyone approaching this domain is supposed to do anyways.
The article mentions tabs being cut into 10 pieces. I imagine with street acid that means 9 days of placebo and 1 day of oh wow I'm trippin' at work.
probably not. acid on blotter paper was originally from acid in solution. the blotter is usually made by pre-measuring an amount of solution that contains the target dose (measured by titration), and then using the blotter to soak up all of the measured out solution. capillary action should lead to even distribution of active compounds throughout the blotter.