The Color of Poison

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I noticed recently that while characters who got hit by Fortitude draining poison (Elan in the Inn) turned green, characters who got hit by Strength-draining poison (V in 712) turned blue. (I am not including Therkla, or Roy back in 38, because they have skin colors that are darker and it is harder to tell what color they turned)(we can't tell from the bubbles, as V's bubbles were green even though his skin was blue)

Are there other kinds of poison, and if so what colors to you think they would cause?

I would think of wisdom-draining as red, reflex-draining as grey, and Inteligence-draining as yellow. Not sure why.