clear guide to color use in digital design, web development, and printing. It covers basics like the color wheel and types of colors—primary, secondary, and tertiary—and explains color schemes such as monochromatic, analogous, complementary, triadic, and tetradic. It highlights how colors affect emotions and branding, mentioning the 60-30-10 rule for balancing colors in design. The guide also explains technical details like color temperature (e.g., 6500 K), how pigments mix colors, and the use of color management systems like ICC profiles to keep colors consistent across devices. It stresses accessibility, showing how tools like ColComp4U help check color contrast and meet standards like WCAG 2, especially for important uses like nuclear plant controls.