Intro: Resistor Reading Tips
To determine the value of a resistor you must carry a chart with you. The color band can represent any one of ten numbers 0 - 9.
While in the Air Force, 57 years ago, learning basic electronics the instructor wrote this mnemonic on the board and I never had problems with resistors since;
Mnemonic Bad Boys Romance Our Young Girls But Violet Giggles Wittingly
Color code Black Brown Red Orange Yellow Green Blue Violet Gray White
for resistors 0 1 2 3 4 5 6 7 8 9
The whole idea is to be able to read the value of a resistor without the chart. Memory aids have always played a part in technology.