The date of production is marked on the glass bottle with a laser marking machine. The glass bottle with a laser marking machine can't be erased. The laser marking is a permanent mark and won't come off unless the glass bottle is melted or etched by a similar laser marking machine, but there will be traces.

The laser marking machine uses a laser beam to make permanent marks on the surfaces of various substances. The effect of marking is to expose the deep substance through the evaporation of the surface substance, so as to carve exquisite patterns, trademarks and characters. Laser marking machines are mainly divided into CO2 laser marking machines, semiconductor laser marking machines, fiber laser marking machine and YAG laser marking machines. At present, laser marking machines are mainly used in some occasions with more precise requirements and higher precision. Used in electronic components, integrated circuits (IC), electrical appliances, mobile phone communication, hardware products, tool accessories, precision instruments, glasses and clocks, jewelry, auto parts, plastic buttons, building materials and PVC pipes.