What tone means is simple. It’s how light or dark a color is, rather than the actual color. Every color produces a variety of tones; how light or dark these are depends on the color. It’s important to realize that tones are relative, that how dark or light they seem depends on what’s going on around them. A tone that’s obviously light in one context may seem darker in another if it’s surrounded by even lighter tones.
White tones are often used in design. White is neutral, it is a strong contrast to the use of color in paintings and accessories. White is cool and refreshing. White expands the living area by reflecting natural sunlight. Along with the use of texture, tonal whites can make for a thoroughly casual setting.