Saltpeter, also known as potassium nitrate or niter, is a substance used in Egypt mainly as a fertilizer and as an ingredient in gunpowder. It is manufactured by evaporating dung and water in a tub.
Water evaporates from a tub at 1 per Teppy Minute only if there is dung in the tub, at which time one dung is used up as well.
After 4 water and 4 dung evaporate from the tub, 1 saltpeter will appear. If you leave larger amounts of dung/water for longer periods of time, you will average out to one saltpeter every 5 dung evaporated.
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