Acidity-try Taco Bell Hot Sauce on a penny and see the results- same with lemon juice on brass and copper - just add salt.
The fruit acid in the ketchup is sufficient to remove the grime from a coin. Although it will bring the coin up nice and shiny, it will also remove any value the coin might have.
Acetic acid is the ingredient in vinegar that remove the oxides from pennies and makes them shiny again.
I know egg makes your hair really shiny && soft but it kind of smells>.<<br /> ketchup does the same thing to deep condition your hair but it doesn't smell that bad:3 I suggest taking a shower after applying them:3
Cuz it's shiny and shiny represents money
10 cents, but it also makes two shiny coins. Two nickels make up the value of a dime.
The vinegar and salt in the ketchup will remove most of the dark tarnish on a darkened or dirty copper penny (you can accomplish the same effect more quickly using just a small dish of vinegar and salt). However, the penny will "clean up" with a slightly beige-pink or rosy color, significantly not quite the color of a shiny new penny.
Washing a coin will take away from the value. Even if it is dirty, just leave it alone. if you clean it details will come off so dont clean coins you might think it would be good to have them shiny but its not
Oxidization and general 'wear & tear'. Coins contain copper - which reacts with the air, making the coin dull. Additionally, grease and dirt from people handling the coins contributes to their dull appearance. Newly-minted coins are bright & shiny.
Keeping them out of the air will keep them shiny
This makes no sense, but you find a shiny in grass, as finding a shiny is 100% random.
...shiny Pokemon are always shiny... ._.
It makes them shiny.