Morgan 1921 with funny toning

silviosi

This Morgan has the Mint luster. Has for me curious color toning. I have from reserve Mint bags acquired some where in 2014.

The Reverse (two different angles and light) show some yellow goldish and near the rim develop blue. On the Observe I have yellowish (grey in the photo), blue and red (pinkish) Do you has one as this? Side 80% yellowish and the rest normal Silver color

PS: I do the ESD-DSX test in my lab and no foreign substances find. NOT THE BEST PHOTOS OF THE WORLD.

PeakRarities

The coin looks "off" to me. The colors and surfaces appear to be unnatural in my opinion.

dsessom

This article may or may not help you, but will give you a basic understanding of how toning occurs, and what causes it.

https://www.moderncoinmart.com/blog/post/toned-coins-everything-you-ever-wanted-to-know-but-were-afraid-to-ask

silviosi

Yes agree, but no molecular change or foreign substances. strange for me. Also the blue and red only on low relief and not on high.

Thanks, Dressom very kind, I was part of the study as Ken Potter made presentations. This it is a good article.

FlyingAl

@DeplorableDan said:
The coin looks "off" to me. The colors and surfaces appear to be unnatural in my opinion.

I agree. It just looks wrong or "off".

That alone is enough for me to say I'd call it "Authenticity Unverifiable".

silviosi

Thanks I agree, I do not think I will find out anytime.

silviosi

For this coin I stay night Up. I ask my brother in Germany and him put me in connection with one of his calorimetry engineer.

after explain and show the photos him say that the silver in intermittent low heating between 16 to 18 deg. and stable environment develop those colors contrary to the spectrum. Him state that no oxidation is on those blooms ( blooms in German mean bars). Him also state that the colors develops are contrary to spectrum and go Yellow-blue-reddish and very long term all reddish. Unknow scientific prove for those reaction except appear only in Silver 800 and high purity.

I want to come back with the scientific explanation from those who work with those metals.

ricko

@silviosi... If I understand what you said above, the tarnish may have been produced by exposure to temperature. I agree with that, and have seen precisely that type of tarnish when I have experimented with heating silver coins. Cheers, RickO