Capitol Press - Printing Essentials reference guide.

The same color will look very different on coated and uncoated stocks - use the right PMS chart.
For added punch when printing 4-color process on uncoated stock, substituting florescent yellow and magenta for conventional inks may be effective.
Metallic inks will lose some of their sparkle and look flat on uncoated stocks.
If critical color match is required, get an ink draw down, laminate or press proof on the stock selected.
Rich blacks or heavy coverage of inks may require a double hit.
If the finished piece will be used outdoors, let us know. We will use special inks.
If you are unsure of the color in the images, put all images on a single test sheet and get one proof.
To compare the colors you see on your monitor with what you will get on press, we provide a test file with a printed reference.

Call us if you have any questions!