Weathering is a depth-dependent phenomenon, where it starts at the exposed surface of the material and then proceeds into the bulk, thus creating a gradient of changes. It is important to note here that the specimen mounting setup in the weatherometer led to one face of the specimen always being hidden from direct irradiation and water sprinkles. One can hence hypothesize that chemical differences between the directly irradiated surface and the other regions, such as the core, would widen with continuous exposure. These chemical modifications are analyzed here by IR spectroscopy.