Well, cleaning would encompass everything if the term wasn't so unacceptable. Instead everybody gets their drawers in a knot as soon as the word is used. I understand it's for the benefit of new collectors but still it's a bit silly. Just my opinion.
I mean... yeah, the coin was wiped/cleaned to begin with, so yeah, Verdi-Care didn't undo the cleaning. Just removed the verdigris and hydrated the dried out surface.
Verdi-Care is a terrific product for conserving copper/bronze coins. I can recommend it without reservation.
Wellllllll - that actually depends on what grading tier you submit the coins under. Use any of the regular grading tiers, yeah no problem, they'll get cleanly graded. (Assuming of course there are no other issues/problems with the coin.) Use the Secure Plus grading tier - nope, they won't. And these two quotes go with the one above. Ya see, Verdi-Care even advertises that it leaves a "protective coating" on the coins. And that protective coating is very hard to see, so hard most graders will probably miss it - not even notice it's there. BUT - if the coin is submitted under the Secure Plus grading tier, then, and only under that grading tier, the coin is run through the "sniffer". And the sniffer picks up that protective coating - detects that it is there in other words - and the coin is rejected and put in a problem coin slab.
This is valuable information, thank you! Wellllll... the so-called sniffer is a surface analyzing FTIR, that would probably not respond to the thin film VerdiCare uses... eh @BadThad ?
I was referring to Doug’s charge that only Secure Plus submissions get the sniffer. I’ve only submitted a couple coins, and always through someone else. This is all good stuff to know, thanks!
ATR only analyzes the surface and isn't THAT sensitive. https://en.wikipedia.org/wiki/Attenuated_total_reflectance
What you linked to is ATR, but the sniifer, as you yourself said is FTIR - big difference. And FTIR is extremely sensitive, right down to the molecular level. So any liquid film, no matter how thin, can and will be detected. The following comes from Thermo Fisher Scientific - "These advantages, along with several others, make measurements made by FTIR extremely accurate and reproducible. Thus, it a very reliable technique for positive identification of virtually any sample. The sensitivity benefits enable identification of even the smallest of contaminants." http://tools.thermofisher.com/content/sfs/brochures/BR50555_E_0513M_H_1.pdf The basics of FTIR - https://en.wikipedia.org/wiki/Fourier-transform_infrared_spectroscopy
We have a few things here. Infrared spectroscopy examines materials by noting which wavelengths of IR radiation they absorb. I first ran IR's with a prism instrument (dark ages) and saw gratings come into use and the advent of the FTIR which made the technique faster and more sensitive. ATR is an attachment to an FTIR that allows the examination of opaque samples. I have used it and have cursed it for it's insensitivity. Try searching ATR or attenuated total reflectance. I think @BadThad could speak with more authority on this than I (or is that me...).