I have seen pennies the same shade of red your picture shows. If it is topical, you can remove it, or scratch part of it off. It really doesn't matter, it is a normal coin. I hope I answered your questions about colors.
The first coin is coated with something, that is not patina. The 1975 appears to be completely normal. The next three Zincolns are too blurry to clearly see what is going on. The last coin also appears to have some surface contamination issues.
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