A coloured solid article having one or more highlighted intagliations (i.e. any stamped or engraved figure, mark, etc.) is coated with at least one film consisting of (a) an optically anisotropic substance (I) of min. refractive index not over 2, and (b) a film-coating agent (II). The article is esp. a tablet or bolus, or a piece of sugar confectionery. The article may be treated, before application of the (I)-contg. layer, with a film contg. a colouring agent, e.g. iron oxides, carmine, natural dyes, water-soluble dyes or their Al lakes, opt. together with an opaque white pigment, esp. TiO2. Claimed (II) are cellulose ether; cellulose acetate phthalate; hydroxypropyl methylcellulose phthalate; polyvinyl acetate (or its phthalate); cellulose acetate; shellac and/or an acrylic resin. - The coating process used is cheaper and quicker than printing and the intagliations are given a colour different from that of the remainder of the tablet etc..
展开▼
