Sunlight resistance grade of Hanghua ink

Level 7. Grade 7 ink is characterized by strong exposure resistance and no peculiar smell. Hanghua ink is a famous trademark and brand-name product in Zhejiang Province. Passed the quality management system certification of ISO900 1 and ISO 1400 1. Water-based varnish and soybean oil were added to the ink, and the odor removal process was in place. The light resistance level reaches 7, and it will not change color after one year of sun exposure.