The requirements of a finished printed part irrespective of the material and type of printing inks is – high gloss, satin, matt finish, chemical, scratch, saltwater, dishwash and alkali resistance besides, many other industry specific demands. To achieve optimal print quality, a proper selection of ink needs to be done depending on the characteristics of the inks in consideration. Generally speaking, opacity, permanence , resistance to chemicals, wettability, flow characteristics ,opacity, flexibility, thixotropy ,tackiness, adhesion and drying times are the main considerations in choosing inks.