I guess a corollary would be: how many of the dipped coins now legitimized in TPG holders were dipped by folks who followed the proper procedures? And regarding perfect conditions, there is actually a fairly wide range of temperatures and humidity levels that will not promote further corrosion due to dip residues. That range of conditions are what I mean by "perfect", but you can call them "best" if that suits you.
There's a high bar on properly cleaning coins with distilled water, acetone, and xylene too, just like there is with dipping. Any of them, done incorrectly can have bad consequences because all of them leave residue or particulates on coins when done incorrectly. But does that mean they are all bad things as well ? You are of course entitled to your opinion, but before you form that opinion perhaps you should consider the tens of millions upon tens of millions of coins that have been saved from certain destruction over the past 200 years or so - and all saved by dipping. And whether you realize it or not, it's a near certainty coins, perhaps many of them, in your own collection have been dipped. No way to know, but you can bet that some have been and some have not been. But f you want to talk about something that's a bad thing, this is probably the worst of all of them - Improper storage, and that includes coin albums, cardboard 2x2s, coin flips both PVC and non PVC, coin envelopes, is the primary reason that dipping, coupled with other forms of proper cleaning, becomes necessary if coins are to be saved. Improper storage is the bad thing. Proper cleaning in all its forms is a good thing, and yes that most definitely includes dipping. Because without it, the vast majority of all coins in nice condition that we all love so much, well, they wouldn't be in nice condition at all. They'd all be corroded beyond belief. And once one understands that , it's pretty dang hard to call dipping a bad thing. To the contrary, what we should be doing is thanking our lucky stars that somebody came up with the idea !
For sure none of my coins have been dipped, except the few I experimented with. I am an adamant enemy of dipping, as I believe it is "coin cleaning" approaching "doctoring". It is a potentially fraudulent activity which is used by unscrupulous individuals to increase the sales price of environmentally damaged coins even as it reduces their ultimate value. It destroys our numismatic heritage for short term financial gain.
Respectfully, unless you got every coin direct from the bank, there’s no way you can make such a claim. I respect your feelings about dipped coins; just pointing out that such a claim is not demonstrable.
I only collect copper, which is easy to spot if it's been messed with, and 99% of my coins are from OBW rolls, so indeed I "got them from the bank". The folks who should be worried about the long term value of their coins are those with freshly-slabbed, blast white silver coins that were not verifiably taken from fresh OBW rolls.
Well, I think this horse is good and dead. 99% isn’t 100%, so my statement stands, but isn’t meant as any sort of insult, just calling things as they are. I agree that those who have blast white silver coins in new slabs have reason to be concerned. Have a great day.