Quote: You have it completely wrong. Those slabs do not protect coins. Look at the warranties that the companies selling the slabs include. No long warranty for copper or other reactive metals. If you have a coin you must protect, take it out of the plastic box and protect it properly. The best and time tested method have been varnishes where corrosion is a problem. Only make sure you pick one that can be removed easily.
I don't disagree. Copper & billon coins especially require regular maintenance.
Casual collectors and people new to coins, however, are probably better off with with slabs, considering the other ways in which they are likely to store their coins.
Most people are unlikely to spend the time necessary to learn & perform successful conservation & preservation activities. They're just looking to acquire some attractive old coins, not pursue studies in chemistry & metallurgy.
I wish more people had your attitude & knowledge here. Unfortunately, people like us don't represent the average collector
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