Mixing Dyes

Is there a trick to it, because I assumed mixing a red, green, and blue dye would give me a white but sadly they didn't. Is there a link to any site or a thread on here that would describe how to get the dyes you want?

Thanks.

You may want to check out this thread...

Dye Color Chart

Scroll about halfway down the first page of the thread, and there's a two color chart posted directly.

Thanks a bunch!