Amnesia Dust is a memory-erasing agent both used and mentioned repeatedly throughout 8-Bit Theater. Akbar is the only shown retailer of amnesia dust,
though he actually sells talcum powder which is most definitely not talcum powder. Early appearances of amnesia dust hinted that the product was simply a scam of Akbar's, but genuine amnesia dust and their effects were used later. As opposed to white talcum powder, genuine amnesia dust is a black, flammable powder and takes effect upon being set ablaze, although that may have just been gunpowder.
Amnesia dust is manufactured from amnesia peppers, which have a similar memory-erasing effect when ingested.