The shape and the surface treatments of the package are designed to render the visual and tactile sensations of the product. The bath salts ("sali da bagno" in Italian) qualities are emphasized by the rough-edge form, similar to that of a crystal, and the coarse-grained varnishing characterized by pigments with an iridescent visual effect.
Reference:
V. Bucchetti, Packaging tra vista e tatto, Edizioni POLI.design, Milano 2007.