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