There are several variables involved with spot colors. A few manufacturers create color guides such as binders, chips, and fan books to show the spot colors and the equivalent process colors. It is important to realize that the color guides fade over time and the paper may change colors so check the date of your guide and replace it periodically.
When you choose the spot color on the monitor, remember that it is simulated in RGB, and not as the spot color or CMYK. Be sure to tear off a chip from the guide and include it with the job.
Remember that if you are trying to match a spot color with process colors, very few colors will match. Many spot colors are outside of the color gamut of process inks. The paper stock that is used for the job will also provide different results than expected. The use of varnishes or coatings can also change the appearance of the color.
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