Special metallized foil
Foil edges are obtained by covering the edges with a metallized foil. It would seem that the foil for coloring the edges is the same as for hot-stamping. However, this is not always the case. The foil for coloring the edges must have very good adhesion parameters. It is also applied in a different way. The foil must stick to the edges very carefully so that there is no effect of breaking its fragments.
Currently, only gold, silver and copper colors are possible. The best visual effects occure when business cards are thick - composed of two or more layers of paper. The thicker the product, then the shiny colors are more noticeable on a single item handed over in person.
Not every paper
It cannot be used on all papers. Not suitable for low density papers, especially cotton papers (Wild, Cotton, etc.). Due to the low density, the backing for the film is then not good and may not "hold" the film layer. Especially because the paper on the side of the split edge has different properties than its surface.