Various tints of pink are values of red. Chroma is the third dimension of color. Chroma is the quality that distinguishes a strong, dark color from a weak one. Each of the three primary colors or hues are at their greatest chroma before the addition of tints of intermixing with other colors. They have not been weakened by the addition of white or black.
Chroma is the intensity of a color.
Thus a color in its greatest intensity is at its greatest chroma. We can see that chroma is very closely related to value in color. They cannot be obtained by mixing together other colors. Orange, green and violet are called secondary colors. They are obtained by mixing in equal amounts two adjoining primaries.