Tips | How to adjust the viscosity of the ink?

1. Hue

Decrease the viscosity of the ink to make the color lighter, and vice versa to make the color darker. But do not blindly adjust the viscosity to change the color, otherwise it will cause other problems, such as water marks, dull color and so on. When toning, it is necessary to master the change of the viscosity of different colors in order to make better use of the viscosity. For example, when the primary color yellow has a high viscosity, it tends to have a red side, and when the viscosity is small, it will appear green; if the green viscosity is large, it tends to be blue, and the viscosity is small, showing a yellow phase.

2. Water pattern

The lower the printing speed, the greater the viscosity of the ink needed, and vice versa. If the speed and viscosity are not well matched, water marks will easily appear. Usually the printing speed is basically fixed, so the water marks are solved by increasing the viscosity of the ink. Another phenomenon is very similar to the water pattern, called “flower dots”, but the water patterns show the dots of very short lines, while the “flower dots” show the dots of circles. The solution to the problem is to reduce the ink viscosity. If it is too serious, there may be a problem with the printing plate or ink quality. By reducing the viscosity, it can only improve the effect.

3. Poor overprinting

There are two cases: one is that the ink of the latter color dissolves the previously printed color, causing discoloration or tailing and ghosting. At this time, the viscosity of the ink of the latter color should be increased; the other case is that the ink of the latter color is If the ink of the previous color cannot be printed, the viscosity of the ink of the latter color should be reduced at this time.

4. Ink transfer

Smaller viscosity helps to improve ink transfer and avoid undesirable “white spots”.