About 1.5¢ for the original bronze coin and maybe another half a cent for the plating. Gold plating is extremely thin, usually measured in hundredths of a millimeter, and it would cost more to remove it than you could get by selling it.
If the surface has granularity to it or just looks strange is been treated with an acid and has no collector's value.
Thin Thin Khaing was born in 1978.
Pretty much non-existent. Post-1982 pennies are zinc with a very thin copper coating and contain very little copper of any economic value.
Penny Lane
Just a little more than $0.01... It actually costs the government more than a penny to make a penny, but it's only like a quarter of a cent difference. Any pennies minted before 1982 are solid bronze (95% copper), and are worth more in scrap than newer ones.
To start with a 1990 Lincoln cent is NOT copper, they have been made from ZINC (.992) with a thin copper (.008) plating since 1982. The coin is face value.
A layer of zinc coated with a thin layer of copper.
There are no 1984 pennies made from steel -- they were made from a zinc core with a thin outer copper layer. So you have a penny that either is missing its copper layer (worth a couple dollars) or one that has been plated by somebody with zinc, silver, or some other similar colored metal (no collector value). If your penny was made of steel, it would stick to a magnet -- try it!
Copper
Today, a penny is made of primarily zinc with a thin coating of copper. This composition is known as copper-plated zinc.
No
Yes, you can thin super glue for better application by using acetone or nail polish remover. However, be cautious as this can affect the strength of the bond.