Tone Color: Tone color or timbre of a sound is determined by the relative strengths, presence, and absence of the different harmonics and frequencies that a sound is composed of. On the guitar, if we emphasize the higher frequencies, a note sounds brighter. If we emphasize the mid-range and lower frequencies, it sounds darker. The manner in which you pluck a string determines which frequencies are amplified and which frequencies are diminished.
Simpler Definition: A brighter color tone can be played closer to the bridge while a darker color tone can be played over the sound hole.
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