color change in animation

in animation i want to change the part color in mentioned area at few min...

any method to do????

iand also  have another one doubt in animation

in config i have created  2 explode .

in expolde animation there is no option to mention the which explode.

now i m  doing like > creating new motion study and mentioning other explode and copy that key and paste that in to my motion study

i want to insert the mentioned explode in animation,

is there is anyother workaround to do the animation

thanks in adv

Parthi