I have a relatively new house (2004 construction) where I was having some mildew problems in the shower. It's a fiberglass pan with tiled walls and glass enclosure. Turns out, the tile was installed directly on green drywall which was fastened directly to the studs. The bottom 6" or so of drywall was in pretty bad shape, but a couple feet up the wall seems to not be so bad. Even though the drywall looks pretty good, the back paper is a different color than I've seen before. It looks much too uniform to be mold and the drywall isn't damp up at this level, so I was just wondering if anyone could assure me that this is just a certain type/brand of drywall and how it's supposed to look, or if it may have been affected by water. The drywall on the other side of the studs is typical brown. Please see the pictures at the links below. Thanks.