Color
Changes a particle’s diffuse color and/or alpha.
This tool is used to give your particles color.
Using Color
Click the
Color button on the Drive Particles tab.Click
the 
particle system you want to be affected and press Enter to confirm your selection.Specify the node settings in the operation controls toolbar or parameter editor.
Note
If you are unable to change the color, try clicking
on the parameters and choosing Delete Channels from the menu.
For specific parameter help see the Color node help.