Nope, you dont get white when you remove dyes. On another forum we discussed this too and you could get another collour then the one you get when buying it (some platmail turned out to be gold when the dye was removed if I remember correctly).
From what i can tell, when you use dye remover on armor, you get the base material color. When I used dye remover on my Pyro armor, it did go white(ish) if I recall correctly. Remover on my warrior's armor made some parts of it gold...