| I'm no luthier, so someone please jump in and correct me if I'm wrong:
The back of the neck is usually done in a finish that is different from the rest of the bass. The body and scroll of the bass are usually finished in a varnish that, as Bob noted, contains a pigment. The back of the neck is usually finished with a drying oil. If the back of the neck were varnished, constant contact with the thumb would eventually wear it away, plus the oil finish feels better to the thumb. This drying oil does not contain pigment, and appears lighter than the rest of the bass.
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