I had originally dyed my 15k set of the pyromancer armor to blue, but when I had put dye remover on it, it turned purple, not the orginal color! Is it supposed to do this? I thought it was supposed to go back to the color you first started with....
Very odd, as far as I know dye remover is supposed to bring things back to normal but, I've never tried to use dye remover on either of my 15K sets. Mainly because the black dye i use on them cost me a fortune which i would not dare use remover on it. So I will never really know.
If you use dye remover with elementalist armor, you will get purple. That's the natural color of it. Most of it comes pre-dyed though (for example, red for pyro and blue for hydro).
A lot of armors have a default color. The pyromancer's base color is purple, the Knight's armor I believe is gold. If you use dye remover, it just sets it back to the base color.