[Battman]

Well if you want to get into it plasma is white hot, ball of burning gases. The small chunks of a fusion reaction occuring within the weapon well in current science anyway. Maybe in 40k the have dyes or something that can be used on super hot gases or maybe its the magnetic containment feild burning off that causes the color.

As to the models perspective any color works, personally I'm a fan of the green but as an ork player theres already too much green so both blue and purple sound like s good idea for plasma or other incomprehensible technologies

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[Battman]

Might be more a ease of modeling thing at that point maybe, a fair few of the early GW store/studio armies seemed to have.

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