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The term " well temperament " usually means some sort of irregular temperament in which the tempered fifths are of different sizes but no key has very impure intervals.
Historical irregular temperaments usually have the narrowest fifths between the diatonic notes (" naturals ") producing purer thirds, and wider fifths among the chromatic notes (" sharps and flats ").
Each key then has a slightly different intonation, hence different keys have distinct characters.
Such " key-color " was an essential part of much 18th-and 19th-century music and was described in treatises of the period.

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