I just got a roll of XP2 back from a Target minilab, and the negatives are purple. I don't suppose this is normal but I'm not sure because I've been working through my stash of BW400CN which is orange by design. The prints they made appear fine, other than some strange contrasts due to the missing orange mask, but are they supposed to be purple? I had been anticipating, oh, clear. Any idea what caused this and how much it's going to effect multigrade printing?