The model, as originally formulated, would predict an enriching at the surface of the more noble element, eventually bringing an end to further dealloying. Calculations (Ref 53) do predict the formation of pits in the alloy surface but also predict the continual decreasing of the pit radius with time, at which time the dealloying process ceases. Much of these issues has been resolved by recognizing the importance of percolation concepts and curvature in dealloying and coarsening processes, as discussed in the next section