The plate is electronically engraved with a gravure or laser engraved gravure with a cell depth of 15 - 25 um, which is shallower than the solvent ink intaglio. This is because the ink is produced by tap water, and the boiling point of water is higher than that of the solvent. Therefore, the ink is not easily volatilized, and the shallow plate can increase the printing speed and avoid water ripple. Alkali resistance of pigments: Pigments are materials that impart color characteristics to the ink and meet the color requirements of printing. Since the resin of the aqueous ink is mostly alkali-soluble, the viscosity and pH of the ink are precisely controlled, and the pH is generally controlled between 8.0 and 9.5. When the pH is higher than 9.5, the alkalinity is too strong, the viscosity of the ink will decrease, the monotonic speed will be slow, and the water resistance will be deteriorated; when the pH is lower than 8.0, the alkalinity will be too weak, and the viscosity of the ink will rise. The ink is easy to monotonous and will form defects such as dirty plate, paste and blistering. Therefore, pigments with excellent alkali resistance must be used when selecting pigments. Relative density of pigments: When the relative densities of pigments for aqueous inks are very different from each other, pigments with relatively low density are simply floating on them. For example, ink-green inks are often co-colored with pigments such as carbon black and phthalocyanine blue lead chrome. The phenomenon of floating color, hair flowering, sedimentation, etc.; when the relative density of the pigment is too large, the stability of the aqueous ink is damaged due to its simple deposition and agglomeration, such as iron red, chrome yellow, etc., often because the agglomeration cannot be stirred. The color of the ink directly affects the color quality of the printed product. Especially for the spot color ink, it is usually first modulated in the ink chamber and detected by a colorimeter. The naked eye has not seen the discriminating, and the requirements of the factory are sometimes required. The ready-to-use professional supplier's color density meter is more complete. The instrument can give the recommended ink color matching formula according to the ink database provided by the ink manufacturer, which greatly improves the working efficiency. Article source address: http:// Lip Tint , Lip and Cheek Tint , Best Lip Tint , Tinted Lip Gloss , Lip Stain Long Lasting Guangzhou Vast Internation Trade Co.,Ltd , https://www.tintsfeast.com