Color is a lot more complicated then it looks.
.

The scientific application & reproduction of color is a broad subject complex.
Despite color's ability to define cultures or influence pyschology, reproduction of an percise shade of green, or any other color you can imagine, can become a very tricky for print.
Luckily, a process has been developed in order to get colors as close to their intended shade. This process takes the technique of mixing two different colors in order to make a new one and quantified it down into percise percentages of four different colors: Cyan Magenta, Yellow and Black.
While that's not complicated, the four color process was developed long before the advent of electronics. Your computer monitor uses an entirely different means of producing millions of color. Computer monitors use Red Green and Blue to blend into all kinds of different colors that make our computing experience as slick as is it today as opposed to back in 1991.
Thats where the problem starts for print. Since color is produced by CMYK colors, the shades and tones that you see in RGB on your computer screen don't translate perfectly. Normally the difference in what you see on screen as opposed in print is nothing more then everything coming out slightly lighter in quality.
At Copy_Graphix Pro, our desire is to do everything possible to serve you, however, sometimes colors don't come out just the way we want them to.