The Field will not color. The exception proves the rule: some special Fields such as the Random or Shader Fields can color without this setting.
These settings can be used if the Field values should be colored using a color or a gradient.
Here you can define the color that should be assigned when the Remapping settings are evaluated.
Here you can define the color gradient, which will be applied when the Remapping settings and any alpha effects that may be included are evaluated.