The carbon film resistor -
color code

Image :
Carbon film resistor.
Ring count from left to right.
This resistor has 27 kohm resistance.

Carbon film resistor - color code
---------------------------------
            
            value   value   multiplier
            |       |       |       tolerance
            |       |       |       |
Color       ring 1  ring 2  ring 3  ring 4 
------------------------------------------
silver                       0.01   +/-10%
gold                         0.1    +/-5%
------------------------------------------
black        0       0       1
brown        1       1      10
red          2       2     100      +/-2%
orange       3       3       1k
yellow       4       4      10k
------------------------------------------
green        5       5     100k
blue         6       6       1M
violet       7       7      10M
gray         8       8     100M
white        9       9      
------------------------------------------
                    without ring 4: +/-20%

------------------------------------------

Example: 
27 kohm carbon film resistor 
with +/-5% tolerance

Ring 1 = red    = 2
Ring 2 = violet = 7
Ring 3 = orange = multiplier 1k
Ring 4 = gold   = +/-5%