Here we present simulations to reproduce the phenomenon of the formation of Liesegang rings in porous materials
     in contact with iron sources.
     The results are produced with a simulation algorithm based on a modification of Keller-Rubinow model, a
    reaction-diffusion system describing the formation of periodic precipitates in porous materials.
    We reproduce two situations: precipitate formation on a specimen of Lecce stone in contact with iron source (nail)
    and precipitate formation on a petri dish filled with agar gel mixed with two reactants: sodium hydroxide in
     the outer ring and ferrous sulphate in the inner ring.
     In both cases we are able to observe Liesegang ring formation in accordance with laboratory experiments.