How are the Electra blue plates constructed?

How are the Electra blue plates constructed?

Electra Blue Plates have an aluminum core and a thick blue hard coating. This coating is designed to absorb the 1046nm wavelength of any fiber laser. Unlike shiny plates, the blue color absorbs the wavelength; it does not reflect it. This makes the Electra blue plate ideal for producing pad printing plates. It is also better for consistent etching.