Laser marking is to use a±∑ laser beam to mark the s£₽♥urface of various substances for a♦α÷  long time. The effect o ‌f marking is to expose the d✘>φ eep material through the evapoα™★ration of the surface materiaλ©l, so as to engrave ex♥®÷↓quisite patterns and text, and th'∑∞e text information will not ₽≈&§fall off or fade for a long timε​¥ e.