Human hair color account for all possible shades of brown, blond, or red (for example, platinum blond versus dark blond/light brown), nor does it explain why hair color sometimes darkens as a person ages. Several gene pairs control the light versus dark hair color in a cumulative effect. A person's genotype for a multifactorial trait can interact with the environment to produce varying phenotypes (see quantitative trait locus). Natural hair color can be brown, blond, black, red, or white; all natural hair colors including grey, white and lightest blond, are shades of brown. The Fischer–Saller scale, named after Eugen Fischer and , is
Lavender (color) a fourth shade of lavender called "old lavender" (a dark lavender gray) (all four of these shades of lavender are shown below). By 1955, the publication of the ISCC-NBS Dictionary of Color Names (a color dictionary used by stamp collectors to identify the colors of stamps), now on the Internet, listed dozens of different shades of lavender. Today, although the color floral lavender (the color of the flower of the lavender plant) remains the standard for lavender, just as there are many shades of pink (light red, light rose, and light magenta colors), there are many shades of lavender (some