A web-page about RealSense on the site of the Unity game creation engine suggests that color-tracking would come under the 'Scene Perception' feature of the camera.
Scene Perception is a feature only available on the R200 model of camera. I would speculate that you may be able to single out a particular color hue using the F200's infra-red functions though. This article may give you a useful starting point about how to do this.
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MartyG thanks for your help in the community.