The invention relates to a layer structure, containing: A. a first, preferably transparent or white,
radiation-engravable layer A. having a first surface a1. and a second surface a2. which is substantially parallel to the surface a1.; at least one transparent plastic layer B. having a first surface b1., which points in the direction of layer A., and a second surface b2., wherein layer B. contains an IR absorber in an amount in the range from ≥ 0.7 wt.% to ≤ 4.5 wt.%, calculated as the solids content of inorganic IR absorber, wherein the layer structure has both a milky white
engraving and a black
engraving, which were produced by means of non-ionising
electromagnetic radiation E. and are visible from at least one side of the layer structure, wherein the black
engraving has an
optical density of at least 0.5, preferably in the range from 0.5 to 2, measured according to ISO 5-3:2009.