Notes: C, Db, D, E, G, Ab, and A - Key: C - Category: Octatonic Scales
The C Chromatic Phrygian Inverse uses eight notes per octave. Because of this same reason it is a member of the so called Octatonic -scales that have Eight-note (or Eight-tone). On the piano keyboard, it is made up of two black keys: Db, and Ab and five white keys: C, D, E, G, and A. This combination makes this scale - as well as the C Prometheus, C Prometheus Liszt, and C Prometheus Neapolitan - as great choices for composing or improvising music.
If we take a look a the key signature of the C Chromatic Phrygian Inverse Scale we can find it has two flats and no sharps. Therefore, on sheet music you will find two accidentals on the score. The notes of this scale are: C, Db, D, E, G, Ab, and A.