Other wire types can also be marked as long as they contain magic pigments. The outermost layer of the sheath with TiO2 is the main limitation of the marking technique described above. In most applications, TiO2 is used as a white colorant, which turns black when exposed to UV laser light. Therefore, only light-colored wires can be clearly imprinted.
The remaining wires can also be laser marked by different mechanisms described in Figure 1. However, these marks will likely not meet strict aerospace standards unless we find another magic pigment that, for example, turns from black to white when exposed to a green laser.