Why do i always have a problem with making particles look super Red?

Idk why but i can never make red look really red. if its a particle. Always turns out oranges pink or what ever.
Wondering if anyone had any comments on this.




Infact my effect is suppose to look like this. Only thing i can think of its the scene lighting doing this.
Right now the green blends in to much with the scene too.

 

You're using and additive shader