Why don't color RBG BBC tags work in signatures?

[Maenad]

I mean, look at my siggy ;-; It's all screwy:T_T:


Edit: I changed my siggy so it'd work, but the rbg tags still don't work. Only the ones that specifically name a color.

[Zid]

You could also use HTML color format.

It's how we have true invisible text.

[Skye]

Yeah, they've never worked in Chrome for me. I think someone made a thread about it before too, I should go find it...