Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
DW+HFWGHA♭HAW+HCWD
What is true of it
D blues is D, F, G, A♭, A and C, and back to D.
Its steps are W+H – W – H – H – W+H – W, where W is a whole step and H a half.
Across the first twelve frets of the ukulele its notes fall in 27 places, which is what makes a scale a shape rather than a list.
Chords made only of these notes
Found by testing every chord in the catalogue against these 6 sounds, not chosen.
Other scales on D
D major pentatonicpentatonicD minor pentatonicpentatonicD major bluespentatonicD majormajorD natural minorminorD harmonic minorminor
C bluesC♯ bluesD♭ bluesD♯ bluesE♭ bluesE bluesF bluesF♯ bluesall 374