Safe Color Warnings in the Color Match Control
If you select the Warn option for the RGB Gamut limit type, the system displays warnings in the color swatches of the Color Match control when values exceed the limits you have set. If you use the eyedropper to select an input or output color that exceeds limits, a warning triangle appears beside the color information in the appropriate color swatch.
You select the Warn option using the Actions button as described in Setting Safe Color Limits.