As introduced in section 3.1 the different fractions in a rubber vulcanizate (detected in terms of their proton fractions) can be distinguished based on their respective T2 times, which makes quantifying the skin and core regions possible. To emphasize the effects of the stiff skin and the soft core, the hardened surface of the 504 h weathered SBR was shaved off using a blade to a depth of roughly 200 µm for separate measurements.