Acid resistance: immerse the printed paper in acetic acid at 20-25 ℃ for minutes, and judge the strength according to the degree of fading

Alkali resistance: immerse the printed paper in 1% sodium hydroxide at 20-25 ℃ for 10 minutes, and judge the strength according to the fading degree

Water resistance: the printing paper is immersed in water at 20-25 ℃ for 24 hours, and the strength is judged according to the degree of fading and dissolution precipitation

Ethanol resistance: immerse the printed paper in ethanol at 20-25 ℃ for 5 minutes, and judge the strength according to the degree of fading and dissolution and precipitation

1. Tolerance level 5 is the highest and level 1 is the lowest.

2. In case of water, the sun resistance will be significantly reduced.

3.Under the condition of low color concentration or dot printing: the insolation grade of 10% color concentration is reduced by 3-4 grades; 50% color concentration, and the sun resistance grade is reduced by 2-3 grades; 75% color concentration, and the sun resistance grade is reduced by 1-2 grades.

4. Insolation Grade 8 is the highest and grade 1 is the lowest.