How to change the color of atoms in brine?

dump.lammpstrj (8.0 MB)
I have made an LAMMPS input script on initial decane-SDS-brine interfacial system. Everything goes well. But, the problem is, I am unable to see the Na and Cl ions in the brine. I have tried to create groups of Na and Cl, but still the situation remains same. First, I run the simultion on decane, brine and SDS individually. AT that time, each atoms were visible. Would you like to say what is the problem here? I have attached the script here. Thank you.
Virginia Tech
interface.txt (1.4 KB)

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