Quiz# 8 Natural or Artificial toning?

What colors do you see?

 

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I am color blind, but I believe that I see green here. To my eye it appears like verdigris, but that doesn't make sense on a 90% silver coin. For that reason, I am led to believe artificial toning.

 

I see green and in places a coppery reddish hue. The outline of the head looks blurred and the overall view looks like it has been harshly cleaned and the colour toning looks uneven and artificial like contact with a chemical

 

I would put acetone on that coin. Looks like PVC damage to me.

 

I see green, black, and grey. Is PVC damage considered natural?

 

Looks like environmental damage to me. Terminal toning.

 

Excellent description of the colors (green, black, and gray) in spit of my poor image. 100% original surface. BTW, I suggest all members drop "HARSHLY" from their numismatic descriptions. In my experience (90+% of the time) it is usually misused.

Keep guessing. NT or AT?

 

I am not a chemist, how do you get green on a 90% silver coin. Environmental or contact with corroding copper i guess.

 

AFAIK, green is a color of the rainbow.

 

NT. I go with this after studying the coin again, There seems to be a natural transition between the colours, no dramatic separation of the colours

 

I think it is harshly NT!

 

I see Neptune and a triad on Ben's cheek! It does look like the streaks go over the lettering. I can't tell from the photo if they are depressed as damage or raised as a stain coloration. It is 10% copper, but I would not expect verdigris. IMO, Jim

 

Trick Question...Naturally toned Franklin that was stored improperly and developed a thick green scum at the edges. Coin Care dissolved the scum and acetone removed the Care.

 

Does thick green scum equate to verdigris?

 

Was it PVC?

 

this was my first thought

 

ver·di·gris
/ˈvərdəˌɡrēs/

noun
noun: verdigris

1. a bright bluish-green encrustation or patina formed on copper or brass by atmospheric oxidation, consisting of basic copper carbonate.

NO.

Many of you have had a leather object with brass fittings. Over time, a soft, green deposit forms where the two materials meet. It is a chemical residue. It occurs on all coins (have not seen on Platinum or Tin)

Here is some of the stuff that typically accumulates - even on GOLD! This stuff is a soft deposit that comes right off with a round toothpick. It is not hard. It is not a powder. Therefore, it is NOT verdigris.

I know what it is not so let's ask a chemist what it is...