To set swatch options, double-click an existing swatch or select New Swatch from the Swatches panel menu.
After you select the color
mode you want, you can use the color sliders to adjust the color.
If you select a color that is not web-safe, an alert cube appears. Click
the cube to shift to the closest web-safe color (which is displayed
to the right of the cube). If you select an out-of-gamut color,
an alert triangle
appears.
Click the triangle to shift to the closest CMYK equivalent (which
is displayed to the right of the triangle).