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In a very polluted atmosphere, such as might be produced by burning oil with a lot of sulfur in in, a penny could turn black in a few hours. Put away and protected, it will take decades or longer.
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∙ 12y ago
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How long does it take for your eyes to turn black after a concussion?
It depends on how old you are and what your life expectancy is. Human eyes will not turn black during a person's life.
How long does it take for a shark's tooth to turn black?
They chew too much tobacco
How long does it take for a black baby to turn black when it is born?
It takes all of 0 seconds. Being born black means they don't "turn" black but are born black. The baby may only seem lighter because of the enclosed space it was in for 9 months and all of the fluids covering it.
How long will a black hole to turn on axis?
If a black hole has spin, it will spin forever.
How long it takes for sharks teeth to turn black?
they have a certain bacteria that's fights it so there teeth stay white but if the teeth go black the fall out and that would take at least a year
How long does it take to turn coal into a diamond?
A long time
How can you turn copper green?
leave it water for about a week or longer, how long it takes depends on size, i would personally start with a penny.
Why does a penny change color if held over fire?
Yes, it turns it gold,but don't keep it there too long or it will turn silver. :):)
Why is the staue of Liberty green not brown like a penny?
the Statue of Liberty is green because it has been there for a long time. Since metal rusts, the Statue of Liberty also rusted. In fact, it rusted enough for it to turn green. If a penny rusts enough, it will also turn green.
How long does it take for a light bulb to turn on?
i millisecond
How long does it take for a body to turn blue after death?
No.
How does a copper penny turn green?
oxygen.
