Typical ink jet printers have four ink colors: cyan (bluish), magenta, yellow, and black. "Photo" ink jet printers might have two or more additional colors. The inks are generally all deposited at the same time, but it's entirely possible that different inks are absorbed at different rates by the surface of your CDs.

If you want to know for sure, you can do the aforementioned test strips, but do several experiments. One with black, and one with each of the other ink colors. At the end, you may conclude that you can handle 50% black but only 20% cyan. That will severely limit the colors you can put onto the final CD, but at least you'll know for certain. (You may find it helpful to use Photoshop in CMYK mode rather than RGB mode, so you can make your test strips more easily.)