Characteristics: - High quality base paper used, even in weight per sheet; - Evenly coated, sensitive to heat and color; - Refinedly cut, consistent in tightness, able to pass machine freely; - Tight and solid in fibre structure, waterproof packing, fit for long-term preservation - 2 red caution lines, each at one metre from the corresponding end to help customers operate conveniently - Condition of preservation: ventilated, dry, clear of light, temperature:≤50, relative humidity:≤80% .