Crystal Violet: Production, Applications and Precautions opens by presenting the main factors influencing the metachromatic phenomenon. The hypsochromic effect is due to the symmetry of the molecule providing the common electronic signal around the central carbon atom. Next, the authors discuss further modification of the adsorbents in an effort to improve their adsorption capacity and make them feasible for use in field applications. The closing chapter reports on the removal of crystal violet dye from water using surfactant-modified zeolite from coal fly ash, surfactant-modified zeolite from coal bottom ash and nanosilica from sugarcane waste ash.