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Interval information
Ratio 400/399
Factorization 24 × 3-1 × 52 × 7-1 × 19-1
Monzo [4 -1 2 -1 0 0 0 -1
Size in cents 4.3335043¢
Name devichroma
Color name 19uryy-2,
nuruyoyo negative 2nd,
Nuruyoyo comma
FJS name [math]\text{d}{-2}^{5,5}_{7,19}[/math]
Special properties square superparticular,
Tenney height (log2 nd) 17.2841
Weil height (log2 max(n, d)) 17.2877
Wilson height (sopfr (nd)) 47
Harmonic entropy
(Shannon, [math]\sqrt{n\cdot d}[/math])
~2.47924 bits
Comma size small
S-expression S20
open this interval in xen-calc

400/399, the devichroma is a 19-limit (also subgroup) superparticular comma of about 4.33 cents. It is the difference between undevicesimal chroma, 20/19 and large septimal chroma, 21/20. By tempering it out is defined the devichromic temperament, which enables the devichromic chords.


The name devichroma was named by Xenllium in 2023. It is a contraction of undevicesimal chroma into a single word.

See also