A few more things about NCS:
* They can refuse to conserve your coins. Many coins cannot be saved, the damage is done and chances of a successful conservation is slim to none.
* They don't always do perfect job. Many of their conserved coins end up in body bag holders.
* Sometimes they only do "good enough" to make a coin holder. A spot or two might remain after conservation, but not bad enough to prevent grading.
* It's usually only worthwhile on more valuable coins and it can be quite costly but sometimes it is fairly inexpensive (~$30) too.
With practice and experience most collectors can conserve their own coins. However, many inexperienced collectors have ruined their coins when attempting conservation.....they turned conservation into cleaning. There's a FINE line between the two and once it's crossed there's no turning back.
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