Cobalt blue makes white appear brighter

Quick answer：

Cobalt blue, a deep, vivid shade of blue, has the property of making white objects appear brighter. This is due to the complementary color theory, where colors opposite each other on the color wheel enhance each other's appearance. In the color wheel, blue is opposite orange, and white can be seen as a mixture of all colors, with no specific complement. Therefore, when white is surrounded by cobalt blue, the contrast makes the white appear more vibrant.