Inorganic sheet carrying symbols for making pigments that is grindable and composed of two layers that have different chemical properties and/or physical properties

摘要

Inorganic sheets (10) of at least two superposed layers are provided with one or more symbols (20) which have a size of between 1 and 10 ìm. The inorganic sheet is made up into pigment flakes (not shown). The symbols on the pigment flakes (not shown) allow a tracing of compositions such as printing inks or paintings and of substrates carrying such compositions.