The LSD is absorbed into the fibers of the paper and trapped when it dries so most of the dose is inside the paper not on the surface. Blotter paper is designed to be absorbent. It wouldn't be hard to work out exactly how much liquid blotter paper can absorb cmxcm until fully saturated by trial and error (assuming absorbency isn't stated by the manufacturer of the blotter paper, it probably is in most cases) and then you can just vary the concentration of the solution accordingly. I think a mix of distilled water and ethanol is typically used as the carrier. I know LSD is stable in ethanol, not sure about acetone.I would think that if you dunked an entire sheet of paper in the solution it would not only be really hard to tell what the absorption density would be (i.e. how much solution would saturate into each 5mmx5mm piece of the paper, though I guess you could weigh your solvent pool before and after dunking to see how much the paper absorbed) but the distribution would also be uneven, especially if you were to hang it vertically (I'd think it would tend to pool at the bottom of the sheet). Using a quick evaporating solvent like acetone would help to mitigate that.
It's interesting, it just popped into my mind the other day and it got me thinking about how it's done on a large scale.
After the solvent dries, I would think the solute (the LSD, or whatever else you're dissolving) would be in a crystalline form - what would keep it immersed in the paper, as opposed to forming crystals that could just fall off when you picked it up? I guess the LSD quantities would be so tiny, but I would still think that it would be in a solid form after the solvent evaporated which would make it susceptible to simply falling off of the paper when it was handled or moved.
the more water to alcohol ratio..... generally means a slower, yet more even distribution of the moelcule in the paper, assuming its not over saturated. IThere's an underlying issue that as the solvent evaporates unevenly it will set up diffusion gradients within the blotter substrate that will lead to eventual concentration variations between the centre and the edges. It is, after all, essentially a crude liquid chromatogram. Rapid drying would probably help reduce this issue - so perhaps best to use a solvent with a high vapor pressure and dry under vacuum conditions.
This guy built a machine to drop 25 1000 mic pipette drops at one time and each big square was cut 4 ways. Still a whopping 250 per dose, but that used to be normal in the 60s
![]()
For Brilliant Color: Packaging the First LSD Blotter
Eric Ghost's cleverly disguised LSD packaging mirrored the 1960s counterculture's psychedelic vision.thereader.mitpress.mit.edu