Spot color ink refers to a pre mixed specific color ink, such as fluorescent yellow, pearl blue, metal gold silver ink, etc. it is not mixed by CMYK four colors, and chromaticity means accurate color. It has the following four characteristics:
1. Accuracy.
Each color register has its own fixed hue, so it can ensure the accuracy of color in printing, so as to solve the problem of color transmission accuracy to a great extent;
2. On the ground.
Spot colors generally use field colors to define colors, no matter how light the color is. Of course, the spot color can also be tinted to show any depth and shade of the spot color;
3. Opacity.
Spot color ink is a kind of covering ink. It is opaque and can be covered on the spot;
4. Wide color gamut.
The color gamut in the register color inventory is very wide, which exceeds the performance gamut of RGB, not to mention the CMYK color space. Therefore, a large part of the colors cannot be presented with CMYK four-color printing ink.