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Color bands were used because they were easily and cheaply printed on tiny components. However, there were drawbacks, especially for [[Color blindness|color blind]] people. Overheating of a component or dirt accumulation may make it impossible to distinguish brown from red or orange. Advances in printing technology have now made printed numbers more practical on small components. The values of components in [[surface mount]] packages are marked with printed alphanumeric codes instead of a color code.
==Resistors
{{anchor|Resistor code}}
[[Image:Preferred values 05 Pengo.svg|thumb|One decade of the [[E12 series]] (there are twelve preferred values per decade of values) shown with their electronic color codes on [[resistor]]s]]
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