The laser engraving test paper is black and can be used on both sides. The laser-printed areas on the paper appear white, with a clear spot edge for easy identification. This package contains 4 pieces of double-sided black laser testing paper. Each piece measures 39x27CM. The laser dimming paper is suitable for use with semiconductor laser marking machines, fiber laser marking machines, laser cutting machines, UV laser marking machines, laser punching machines, laser beauty and spot removal instruments, and more. Cut the laser engraving paper to the desired size. Soak the paper in water for 1-2 minutes. Place the black side of the laser marking paper onto the item you want to engrave. Use a paper towel or a hair dryer to dry off any excess water from the laser color paper. Utilize a laser engraving machine to engrave the desired pattern and remove any remaining excess laser color paper. Laser test paper can be used for debugging the performance and spot quality of laser marking machines, laser welding machines, laser cutting machines, testing spot adjustment and energy of picosecond laser cosmetic instruments, laser eyebrow washing machines, as well as for evaluating the performance of other light sources. These laser engraving papers are suitable for a variety of non-metallic products such as ceramics, cups, tableware, crystal, jade, artificial gemstones, plastics, resins, acrylics, and more. The laser color marking paper is made of high-quality material that is resistant to fading and scratching. The engraved patterns adhere firmly to metal, glass, and ceramic surfaces for long-lasting results. Name: Laser Engraving Marking Paper Material: paper Color: Black Size: 39x27CM Package Contents: 1 set x laser paper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.