Apple Motion 4 - Manual (Page 661)

All particles generated by that cell are now red.
8 Use the Opacity Over Life control to make this cell’s particles fade out over their life.
9 To make the spark particles spin as they move away, set the Spin parameter value to 60.
10 In the Layers tab, select the Flare01 cell of the particle system. Its parameters automatically
appear in the Inspector.
11 Follow the procedure in Step 7 to make these particles light yellow.
12 To make the particles generated from this cell spin in the opposite direction, set the Spin
parameter value to –60.
661 Chapter 11 Working with Particles