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Grain Size of Silver

I am trying to determine the grain size of the silver blanks. Is it is fine if I do the surface finish to 0.05 microns? What kind of etching agent should I use to etch silver? (I am using .9997 pure silver) Any advice greatly appreciated.

You can use acidified potassium dichromate solution, or ammonia/hydrogen peroxide solution:
10 ml sulfuric acid
100 ml saturated potassium dichromate solution
2 ml saturated sodium chloride solution
Dilute 1:9 with distilled water before use. Useful for silver and copper silver alloys.
50 ml ammonium hydroxide
50 ml hydrogen peroxide.

Must be used fresh! Good luck!

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