Primary Colors

 black on    black  white on    black 
 black on     gray  white on     gray 
 black on   silver  white on   silver 
 black on    white  white on    white 
 black on   yellow  white on   yellow 
 black on     lime  white on     lime 
 black on    olive  white on    olive 
 black on    green  white on    green 
 black on     teal  white on     teal 
 black on     aqua  white on     aqua 
 black on     blue  white on     blue 
 black on     navy  white on     navy 
 black on   purple  white on   purple 
 black on  fuchsia  white on  fuchsia 
 black on   maroon  white on   maroon 
 black on      red  white on      red 
 black on      XXX  white on      XXX 

Array
(
    [0] => black
    [1] => gray
    [2] => silver
    [3] => white
    [4] => yellow
    [5] => lime
    [6] => olive
    [7] => green
    [8] => teal
    [9] => aqua
    [10] => blue
    [11] => navy
    [12] => purple
    [13] => fuchsia
    [14] => maroon
    [15] => red
    [16] => XXX
)