While I agree that using stock sugar pills moistened with stock solvent for the placebo sham would almost certainly be perfectly OK, I have to admit a preference for doing it properly.
By properly, I mean to prepare the placebo solution in exactly the same way as the remedy, with the only difference being that the placebo has no mother tincture added at the beginning. It is succussed and diluted and "potentised" in exactly the same way, otherwise.
Note Rustum Roy's experiment. He tested an unpotentised blank (stock solvent) and a potentised blank (solvent that had gone through the entire rigmarole, only excepting the presence of the mother tincture at the beginning). He allegedly found significant differences. I would like to be sure that what is being demonstrated is actually related to the presence of the mother tincture, and not some esoteric property of the shaking and diluting.
Rolfe.