The remaining five notes of the chromatic scale (the black keys on a piano keyboard) were added gradually; the first being B which was flattened in certain modes to avoid the dissonant tritone interval.
Tips for printing coloring book page or coloring sheet:
Step 1: Click on "Print" link of your choice, if you want a
Musical sheets image for coloring yourself then you need to click on "Print
Musical sheets Coloring page (B/W)" link. If you want colored (already filled with colors)
Musical sheets graphic to print then click "Print
Musical sheets Coloring page (Color)".
Step 2: Now a new pop-up window will open along the
Musical sheets image of your choice (if new window does not open-up then you may need to check your pop-up blocker settings.). Now click on "PRINT". This will open printer dialog, select your print and print.