Someone was telling me that the metal is impure and so the wanted to take advice from experts of the coin as I dont have idea how to determine the metal which can make a person to comment on the coin as fake.
Thank you every respected members who gave there expertise view. I really appreciate everyone's help. My one query is -Did the Russian Emperor period the metals used for producing coins were mix metals or always contain pure metal?
I am not an expert on these coins, but I think the answer is" it depends on which coin, and what you mean by "pure."
Catalogs call your 2 kopeck coin "copper." My guess is that this is copper containing maybe 1 - 2% of other impurities after the smelting process. Bronze for coins typically has at least 5% of other metals intentionally added (mixed) to copper.
"Silver" coins made in the Russian Empire at the same time contained 87% silver.
Maybe one of our Russian members has more details.