Blue Keypad Backlight, blue laser etching
Remarks:
For a general backlight silicone keypad made by laser etching, the colors distribution and production just like this.
----First painting layer is in transparent white on the transparent silicone surface.
----Second painting layer is in opaque black or dark gray.
----Laser etching to form the white symbols for backlight.
If use the orange, red, blue(light blue), yellow colors as the second painting layer, it is very difficult for a good etching effort, due to these colors are very negative for absorbing the laser ray energy.
After many years engineering/manufacturing experience, we have good solution.