Over time the colors on your SpyderCheckr color cards will fade with exposure to any light source. This gradual fading will eventually affect the accuracy of color balance in your photography workflow. When you notice the red patch has changed to a yellow-orange color* in the FadeCheckr window at the bottom left corner inside the Checkr, it is time to replace the color cards. This will assure you have the true spectrally engineered colors for all 48 patches on the two cards, providing you with the utmost in color accuracy for your photography.