Multiple choice technology Blue is what number on the resistor color code? 1 4 2 6 Reveal answer Fill a bubble to check yourself D Correct answer Explanation In the standard resistor color code, blue represents the digit 6. The color code sequence is: black(0), brown(1), red(2), orange(3), yellow(4), green(5), blue(6), violet(7), gray(8), white(9).