400/399
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| 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, reduced |
| 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 2.3.5.7.19 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.
Etymology
The name devichroma was named by Xenllium in 2023. It is a contraction of undevicesimal chroma into a single word.