Resistors need 3 colors to identify them. There are 2 significant digits and a multiplier. BBROYGBVGW = 0-9
If you find some pre WWII resistors you may see a body color (1st digit) a ring (2d digit) and a dot (multiplier). It has just been 3 bands for the last half of the last century. You may also see a 4th bandthat designates tolerance.
