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Please Note: 1. The time for the color to fade is related to the writing material, temperature, humidity and other external environment. Under normal circumstances, red will automatically disappear within 1-7 days, and purple will automatically disappear within 2-14 days. 2. Because the chemical composition and physical properties of different materials are different, please make a small test before putting it into production. If you find that the effect is not good, please stop using it and contact the dealer. If it is put into production without testing, the company will not bear any responsibility for the consequences. 3. After use, please cover the pen cap in time and store it in a cool place, avoid direct sunlight, to ensure that the effect is still smooth next time. This product is only used for industrial production marks, please do not use it to fill in written contracts, sign and other important documents!