Concerning the writing of the Color Data Matrix, various types of media have been considered. The following table shows the tested materials and techniques used for the writing:

Media types Writing technology
printer/photocopying paper Inkjet printing
Photo quality paper Laser printing;
Plastic Off-set printing
Metals (bulk); brass, stainless steel,titanium, gold. Laser
Metals (coatings): chromium, titanium and zirconium deposited by techniques under vacuum in a reactive atmosphere, ruthenium, gold, palladium Laser

As far as printing on metal is concerned, a laser marking specially purchased from Sigma Laser by Top Finish 2002 Srl has been used.
The coloring of the metal is due to a phenomenon of surface oxidation, induced by the energy transferred to the metal by the laser beam.
The colors obtainable vary from metal to metal, as shown in the figure below

Intervento cofinanziato POR CReO FESR 2007-2013 Linee 1.5 e 1.6

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