Should you encounter a resistor and don't know the color codes, use this page to determine its resistance value.

Calculate Resistor Values from Color Codes ... Resistance Value:

If the resistor has one more band past the tolerance band it is a quality band. ... 1 How to read Resistor Color Codes

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This resistance value chart corresponds to the values obtained with the resistor decoder.

You will notice with the E12 values that each succeeding value falls within the plus / minus 10% of the previous values. ... Resistor colour code chart

A preferred resistor value chart for laminating back to back with the color code chart. And some notes on Deciphering the Color Code. Thanks to Peter Veness MIEE, CEng.

First you need to get your hands on an LM317T variable voltage regulator, a 1N4004 diode (or similar generic diode), a resistor of the proper value (see Calculating R3 resistor value),

But, you can also select any ohmic value and tolerance that you need ... and adjust the TCR too, if you want. ... together with a computer tracking chart ... at no charge.