In the chart below I have specifies some of the colors possible with the RGB color spectrum. RGB stands for Red Green Blue. Each color can have two digits with a possibility of 00 through ff in hexadecimal, RRGGBB. In the light spectrum colors tend to cancel each other out.
 For example, BLUE + GREEN =AQUA and GREEN + RED=YELLOW. If you would like to learn more about RGB and RYB color schemes then please click on the link labeled "RYB vs RGB" in the related box above.