Orange (colour) and absorb mostly greenish-blue light. (See also shades of orange). Other orange pigments include: The orange colour of carrots, pumpkins, sweet potatoes, oranges, and many other fruits and vegetables comes from carotenes, a type of photosynthetic pigment. These pigments convert the light energy that the plants absorb from the sun into chemical energy for the plants' growth. The carotenes themselves take their name from the carrot. Autumn leaves also get their orange colour from carotenes. When the weather turns cold and production of green chlorophyll stops, the orange colour remains. Before the 18th century, carrots from Asia were usually purple,
Shades of orange right. This shade of orange is unique to the University of Tennessee (UT), defined by the institution as Pantone 151, and is called "UT orange". It is offered for sale by The Home Depot and licensed by the university. According to the university, this shade of orange is derived from the American daisy, which grew in profusion on the oldest part of the campus, The Hill. "Spanish orange" is the color that is called "anaranjado" (the Spanish word for the colour "orange") in the "Guía de coloraciones" ("Guide to colorations") by Rosa Gallego and Juan Carlos Sanz, a color dictionary