The stamped serial number on barrel can be restored by
A. Hydrofluoric acid
B. FeCl3 reagent
C. CuCl2 reagent
D. AgCl reagent
Answer:C
The stamped serial number on barrel can be restored by
A. Hydrofluoric acid B. FeCl3 reagent C. CuCl2 reagent D. AgCl reagent