You need to change the color at the specific interval for this project.
Create a new file.
View > Rulers
View > Grid > Show Grid
View > Grid > Edit Grid (10 X 10 px)

Drag the horizontal & vertical guide lines to get the center.
View > Guides > Lock Guides
Create the shape or get it from any symbol font. If it is font, break it apart.
Modify > Break Apart
Select the shape.
Insert > Convert to Symbol

Insert Keyframe at 10, 20, 30, 40, 50 & 60.
Reduce the size of the shape at 10, 30 & 50.
Create motion Tween.

Select the 10 th frame.
Modify > Frame
Select Effect tab.
Select Tint from drop down menu.
Change the tint color.

Keep on changing the color at 10, 20, 30, 40, 50 & 60.
Save the file.