Lighting, Light Boxes and Photographing True Color

This week's PPA Challenge is a color challenge using:
Try as I might, I cannot capture the true color of my project.  I purchased a light tent and photo lights this week, and even using these I am not happy with the photo results.  The greens and indigo are not true.  The card base and the 3" scallop circle are the same card stock, yet the color looks different on each. In addition to learning this craft, I need instruction in photography.