Nuclear magnetic resonance (NMR) images were obtained on asphalts which were dissolved in toluene and titrated with iso-octane to the point of onset of flocculation. When iso-octane was added to the asphalt and the mixture stirred, asphaltene precipitation proceeded in a normal fashion. However, when the titrant was added slowly to minimize mixing at the iso-octane-asphalt-toluene interface, the images showed that a layer of material formed at the solvent interface which was different from the asphaltenes or the maltenes. The formation of this layer appeared to depend on asphaltene concentration and degree of aging, i.e. the greater the asphaltene content and the degree of aging, the more prominent the layer. The WC ratio of the layer was similar to the resin fraction of the asphalt. These observations suggest that NMR imaging might be used to assess asphalt compatibility in aged asphalts.