Most design marks are submitted to the USPTO in black and white / grayscale format, with color not being specifically claimed. If your mark includes any amount of color, all colors used in your image must be listed on the trademark registration application, and there is a risk that your trademark protection could be limited to your design as embodied in only those specific colors you have claimed. For example, if your registration application claims red lettering of “Acme Inc.” on a yellow background, your trademark protection may be limited to only the red/yellow color combination, so another company may conceivably be able to use the “Acme Inc.” in blue lettering on a green background without infringing your trademark. This is why color marks are usually avoided. Note that if you wish to avoid registering a color mark, you must submit a black and white/grayscale image of your mark to the USPTO.