====== Sanding ====== 

Procedure
  * Secure (glue) die to surface
  * Use fine sandpaper (1200+?) to remove a layer
  * Using polishing paste, Dremel polish layer to photographic quality

Advantages
  * Materials readily available
  * Safe (for user)
  * Low cost

Disadvantages
  * May not be as repeatable as chemical etching
  * Labor intensive
  * Risky, easy to grind too far

Notes
  * Nohl used Dremel + sandpaper for his MiFare Classic attacks according to CCC talk