More than 6 million tonnes of carbon black per year are produced worldwide. The major part is used as reinforcing filler material in tyres and mechanical rubber goods. For applications in advanced tyre treads a new generation of so called inversion blacks were introduced. The interactions between the finely divided powder-type materials and the polymers and additives in rubber mixtures the surface properties at the edges of the basic structural units of carbon black are essential. For in-rubber applications low polarity is required, but enhanced amounts of structural disorder and, therefore, of chemically bound H which terminate the free valencies of the aromatic graphitic sheets. IINS on TOSCA is uniquely able to study these relevant sites of finely divided technical carbon blacks. We wish to compare a conventional carbon black and an inversion black with enhanced surface roughness.