There are a few things you can do to desaturate colors in Illustrator. The first is to use the color wheel. This is a tool that lets you select colors and then adjust their brightness and saturation. The second thing you can do is to use the Hue/Saturation tool. This tool lets you adjust the brightness, saturation, and hue of colors. Finally, you can use the Curves tool to adjust the color temperature of colors.
