I am fairly new to this site, but I've done some scowering around and searched through the newest aqquisitions topic. It appears to me that at least half of you are buying artificially toned coins. The crazy thing is I'll be looking at a coin that is worth nearly 1,000 and it is AT. On top of that there will be about 10 likes below the picture. Are you guys aware of the difference between AT and NT. I just can't believe so many are being suckered into this toning crap. that's all.
Please educate us on the subject of toning Mr. Lawrence! We promise to remain civil when we disagree.
To answer the original question, ZERO. Toning's a racket. Toning is a coating of silver sulfide from 40 to 125 nanometers thick (Weimar White's book, "Coin Chemistry"), and the chemical reaction is the SAME whether it's natural or artificial toning. In the long term, silver sulfide will cause microscopic pitting. The same process occurs with flatware, requiring frequent polishing. The original source of the sulfur is the atmosphere, the packaging, the albums, or adjacent paper(s), or a combination thereof. That's why they dipped coins 25 to 50 years ago, to get rid of the toning. But in that time span, the toning has formed a second coating. "Purple" toning is especially hard on a coin's surface. Buy and read White's book.
Without specific examples, your opinion is just that. However, I still suspect that you have tampered with the stats. Chris
I think we've already heard his opinion. Now, we should wait for him to produce the data to back up his opinion. Chris
The fact that he claims that at least half of us are buying AT coins, means that one of us (you or me) is a fool. Chris
Weimar White's book is garbage and his opinion on toning is considered the lunatic fringe in the numismatic community. I left that read getting the feeling that he was either part owner or developer in some coin preservation product.