Earlier Copper Cents RD

Question,
Copper cents get brown after awhile, I guess.
How do some stay RED ?
For instance 1910 RD in a PCGS holder.
Any early date for that matter.

 

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A product of the environment. Early copper that is still red is a sight to behold.

 

For me it's something avoid unless it's a very modern item. I got burned years ago on a so-called "Red" large cent from the 1850s. It was NGC certified red. The #1 copper expert told it was among the finest known for the Newcomb variety.

Then it started to turn Brown after a few months. I finally dumped it for a loss. If I buy old copper, I want it to look like this.

 

...only ones that are kept hermetically sealed in a mayonnaise jar on Funk and Wagnalls porch.