Visit the new color calibration print product page. It's a small (very small) investment but can save you a lot of trouble and expense if you have problems getting accurate color.
To use it you will download the pdf version and then compare it to the hardcopy print we send. Adjust your computer screen to match the colors and brightness levels in the print. While it is not the most accurate method it is much better than keeping your fingers crossed your first print will be accurate.
You can order the print on different media types. Since some media types can output a higher range of colors than others, order versions on the media types you use or plan to use.