[Molvis-list] how to get more shades in rasmol?

[Kristina Rogale Plazonic]

Dear all, 

I'm trying to color residues by the degree of conservation in the multiple 
sequence alignment of the protein. But I cannot get enough shades, only 4!
I get this warning: 
Warning: Unable to allocate shade!

Has anyone tried a similar thing, has any idea how to resolve the shade 
issue, or knows of another program that does this? 

Thanks very much!
Kris

My script looks like: 

load /home/kris/pdb1un0.ent
wireframe off
select *164A.ca
spacefill
color [54, 0, 201]
select *165A.ca
spacefill
color [0, 118, 0]
etc... for all residues

and I'm using 32-bit version 2.7.2.1.1.