.Door nobs are actually made with brass, bronze, cupper and are gold plated for a special reason apart from beauty and design. As we know it, Iron responds to corrosion easily than the rest( it get rusted when water and other substances are applied to it quickly than the others. Cupper, Brass, Bronze easily get rid of germs easily.
.Rough edges on the sides of coins was adopted from an old practice.
Ancients times, the weight of gold coins were actually made to fit the value of the coins. Gold smiths and other people would shave of the edges of the gold coins to create newer coins thereby reducing the value of the initial coins. To get rid of the practice rough ridges were added to edges of gold coins while they were created by certified Gold Smiths so that people would be able to differentiate between the good and the bad gold coins.
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