Vinegar is only harmful to those with respiratory problems such as Asthma, sarcoidosis, S.A.R.S and a few others. When boiled individuals with the listed diseases will experience constant illness and a weakend immune system. Overexposure to vinegar in individuals with the listed sicknesses will cause serious damage!
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The best method for achieving perfectly hard-boiled eggs is to use vinegar in the cooking process.
Apple cider vinegar is not harmful in no way but one thing with it is that it is way too strong
It is an acid
vinegar
Not much, but if you soak it in vinegar the shell will dissolve!
between 6-8 months if boiled first in vinegar
If it is already boiled nothing will really happen except vinegar eating it up. If it was a raw egg with the shell intact, the vinegar will dissolve the shell and you can watch the proteins get denatured.
Diffusion between hypo/hypertonic substances across a semipermeable membrane. AKA: The water from the vinegar fills the egg
Boiled potatoes could develop harmful mold even in a refrigerator, in a period of 3 weeks. That is a very long time to store boiled potatoes (unless frozen, which is safer). Three weeks at room temperature is far too long for boiled potatoes (although raw potatoes can last that long).