Individual pyrrole molecules readily join together into larger molecules called polypyrroles  If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite' s inner channels  When zeolite changes color from yellow to black, it means that on or in that zeolite polypyrroles have formed from pyrrole  Yellow zeolite free of any pyrrole was submerged in dissolved pyrrole
The zeolite turned black even though no polypyrroles formed on its outer surface
At least some of the pyrrole in which the zeolite was submerged formed polypyrrole chains.