One of Sennert's most notable experiments was a variation on the "reduction to the pristine state." Taking an alloy of gold and silver, the silver was dissolved from the alloy in aqua fortis. In the classic "reduction to the pristine state," the silver was then precipitated out of the aqua fortis by the addition of salt of tartar and then heated in a crucible to return it to its recognizable metallic form. Sennert's innovation on this experiment was the addition of pouring the silver-aqua fortis solution through a paper filter before precipitating the silver from the solution. This experiment was used as evidence that the silver remained in the mixture in the form of minuscule particles, rather than dissolving into its Aristotelian components. It appears to have inspired similar experiments on the part of Robert Boyle and others used to establish acceptance of Corpuscularianism.