UV solid-state laser can print white text on black plastic buttons The black or white marking on plastic should elected 355 ultraviolet laser.   The mouse and keyboard are necessary tools for our daily work   How are numbers and letters marked on the keyboard? Let’s look at the UV laser technology.   Ultraviolet laser marking is to use the laser thermal effect to ablate the surface material of the object, thereby leaving a permanent mark. It has the advantages of non-contact marking, low cost, no consumables, good permanence, no deformation, no pollution, high speed, high stability, and high precision engraving, etc.