What is the dullness or brightness of leaf color depends on conditions of?

The dullness or brightness of leaf color depends on the age of the leaf and the conditions of temperature, light, and moisture. Older leaves tend to be duller in color than younger leaves. Leaves that are exposed to more sunlight will be brighter in color than those that are shaded. Leaves that are grown in warmer temperatures will be brighter in color than those that are grown in cooler temperatures. Leaves that are grown in more humid conditions will be brighter in color than those that are grown in drier conditions.