A high-precision marking pen specially designed for glass. The ink is white when applied, but after laser engraving with the xTool F1 Ultra, it leaves a clear, permanent black pattern. The ink flows evenly, writes smoothly, dries quickly, is clean and efficient, and is safe and environmentally friendly. Easy to clean, simply wipe with a cloth or rinse with water after engraving. The formula is safe and environmentally friendly, compliant with ASTM D-4236 standards.

• Simple and efficient to use, just three steps: apply, engrave, and wipe, making it easy to master.
• Clean the surface of the item to be engraved before use. Press the pen tip multiple times until ink flows during the first use.
• Compatible with blue-light lasers, CO2 Lasers, Fiber lasers & MOPA lasers