This is a simplified simulation of how inks can create a different color in the print than what appears on screen. In this image, the outline around the right half of the “A” is a blend of 100% cyan overlapping with 100% magenta. While there is no gap between the color blocks, there is a new color where it overlaps.
This is actually an effect that I have observed more obviously in 19th century prints, when there were metal plates lined up meticulously to create color fashion plates.
In this fashion plate from the August 1865 edition of “Peterson’s Magazine”, the dark red colors were created by layering the red, light teal and black colors. There was no dark red metal plate, but the way the inks lined up created that effect.
Where the two dresses overlap in this picture, there’s a different tone of blue that doesn’t appear anywhere else.
The effect of overlapping inks is easier to see in 19th century publications because the technology was simpler and less sophisticated than 20th and 21st century print techniques. Aside from making an artistic statement or being interested in history, the metal plate techniques used back then are not commonly used now.
However, versions of this exaggerated intentionally for dramatic effect can be seen quite a lot in pop art from the 1960s!