I am teaching an child of 7 who has white key absolute pitch.
In particular, they can sing any notes of the C major scale without a reference tone and can name the pitch of any of the white notes without looking.
However, they cannot currently do either this for the black keys. I put most of this down to their music education so far in which most of the songs are in C, G, or F.
I am looking for suggestions of exercises for them to develop the same ability for the black keys.