Vapochromic compounds change color when exposed to vapors of organic compounds. We have recently reported the first examples of simple vapochromic salts, [Pt(L)Cl]X (L = 2,6-bis(1-methylbenzimidazol-2-yl)pyridine), X = Cl^- and PF₆^-). These compounds undergo rapid, pronounced and reversible changes of color and luminescence in the presence of certain organic vapors. The vapochromic response and selectivity can be tuned by simply changing the anion. For example, the PF₆^- salt changes from orange to violet when exposed to acetonitrile vapor, whereas the complementary chloride salt changes from orange to red in response to methanol, chloroform, ethanol and acetonitrile. Removal of the vapor source restores the original orange color of the material, and gravimetric and ¹H NMR measurements are consistent with uptake of near stoichiometric quantities of vapor molecules. In this presentation we will discuss the vapochromic behaviors of this class of compounds, as well as mechanistic insight gained from spectroscopic and X-ray diffraction studies.