There's no way to tell the difference without having the metal analyzed. It doesn't seem likely that someone would try to counterfeit the common 1943 steel cent -- it's only worth a few cents. The one that sticks to the magnet is likely the real one. The other one could be a zinc plated, altered date, copper penny from ?? year. It's also possible it was struck on a foreign planchet, especially if it is slightly different in size or weight. It's impossible to give values without knowing exactly what you have. There is no difference.
A 1972 US cent would be made of solid bronze and have a different color than a new one, but not goldish. If it sticks to a magnet, it is either not real or has been coated with some metal with magnetic properties.
Brown or it is the color of bark
Its fire place with colorful sticks I think?
pink
If it is silver in color and sticks to a magnet, it is real (and worth between a dime and a few dollars). If it is copper and doesn't stick to a magnet (and has not had the date changed by some nefarious means), it is worth several thousand dollars. you could tell if it is very rusty and you also can go to a secailest
shiny brown
You can use food dye to color pop sticks, but the surface coating may not stain as well as you think.
Yes. Most brands of glow sticks are waterproof. Sometimes it depends on the color
In my high school chemistry class, we had an experiment where we mixed zinc with sodium hydroxide, heated the solution, then soaked pennies in it. After a few minutes, the zinc would adhere to the coins, making them silver in color. That said, a 1975 penny is currently worth 2 cents for the copper.
black
well it could be on what effects does bleach as on pennies color.
No particular reason. The color could be ANY color, but magnet makers began dipping one pole in paint to mark the North pole, and red paint was available. Over time, it just became the color ro use.