An interesting thing about key signatures is that at the end of the circle of fifths--the sharp keys--and the circle of fourths--the flat keys--the Ends Battle and Charles' Father in Grimace's write up, the sharps and flats are white notes.

This is to be expected, though most piano students do not. It is simple arithmetic: there are seven different notes in the octave, each of which can be sharped or flatted, but only five black ones, hence E# and B# are played as F and C respectively, and Cb and Fb are played as B and E respectively.

Regardless of the colour, all notes shoud be treated the same, though most piano students, including myself, even now, cannot yet do it perfectly.