For each camera model it supports, Camera Raw uses profiles to process raw images. The profiles are produced by photographing a color target under different white-balanced lighting conditions. When you set white balance, Camera Raw uses the profiles for your camera to extrapolate color information.
Sometimes colors rendered by the Camera Raw plug‑in do not look as expected. The cause may be a difference between a camera’s profile and the profile in Camera Raw for that camera model. Alternatively, the photo may have been taken under nonstandard lighting conditions beyond the compensating range of the Camera Raw plug‑in.
To render non-neutral colors differently, use the Hue and Saturation controls in the Calibrate tab to adjust the settings for the profile built into Camera Raw. You can also specify whether to use the profiles built into Camera Raw or a profile built into the file itself.